I'm back with the next chapter of the story! Sorry that I've been gone for quite a while, school and life in general kept me busy. I finally have time to sit down and continue this story, now that I'm done with school until September. This chapter will be a big one as an apology for taking so long. The results of the latest poll are in and the winner was decided. The villain that will attack the Touto Institute of Advanced Matter Physics is an Essence-enhanced Smash sent by Faust. From re-watching Kamen Rider Build, I know exactly which essence I want the Smash to have.

This chapter is going to see class 1-A accompanied by the Build crew, go on the promised field trip to the Touto Institute. A lot of background information about the Build crew, the Rider System, the Pandora Box and the fullbottles will be touched on this chapter. Sento and his friends are going to show class 1-A all that the Institute has to offer, as well as answer any questions the first-years may have for them.

Some previously established characters will be returning this chapter, as well as some new ones. Where the plot of this story is concerned, I plan to mainly follow the path of My Hero Academia's canon but diverging in some ways to incorporate the Build crew. Some events that happened in Build will happen here, and some will be different. Lastly, there's the matter of Bakugo pressing Izuku for some answers last chapter. That's going to be addressed here.

I'm happy that my first story on this site is shaping up like it is! I plan to have some more polls for ideas for what should happen in future chapters. Keep an eye out for them!

I do not own Kamen Rider Build, My Hero Academia, or any of the soundtracks mentioned.

Without further ado, here's the chapter!

A Trip to Remember

UA Teacher's Lounge

All Might had just come back from discussing the joint exercises done between class 1-A and class 2-A, the Build crew. Aizawa had informed him that due to how well the students performed, that he got the ok from Principal Nezu to conduct the field trip that Sento had suggested. The young genius assured Nezu, Aizawa and All Might that he and his staff over at the Touto Institute would take very good care of the students. Lunch would be provided to the visitors and the trip would be quite educational. Sento did have one very important condition, however. He told Nezu and the two teachers that the students would have to sign a waiver once they arrived at the Institute. The document would outline that class 1-A are not to share any details about what they witness and learn about whilst at the facility.

Nezu readily accepted the terms, as he was very much aware of the Pandora Box in Sento's possession and how valuable it was to not only Touto, but Hokuto and Seito as well. The principal was aware that one doesn't need to be a genius to recognize the potential risk of some governmental body or a criminal going after the Box after hearing about it. After reviewing the waiver provided by Sento for a few minutes, Nezu gave his approval and promptly left to drink some tea and do principal things.

All Might, alone in the lounge, sat down in an empty chair and drank from a water bottle. The hero thought to himself "I'm happy that young Midoriya didn't get expelled. That would've made it harder to properly train him as my successor! I must thank young Kiryu for his timely assistance. If he is anything like Izuku, maybe he would appreciate an autograph from your's truly!" Toshinori was pulled out of his thoughts by the sound of the teacher's lounge door being opened. He turned to see Izuku, who was looking like a kid who got caught with his hand in a cookie jar, and Bakugo, who was eerily calm. The two students approached All Might.

All Might greeted the two "Ah young Midoriya and young Bakugo! What are you two doing here? Is there something that I can help you with?" Izuku decided to tell his mentor what was going on "All Might, Kacchan here is curious about how I have a quirk now and he wouldn't let it go. I brought him here so that he can hear it from you. I promise he won't tell anybody, we can trust him." Bakugo was surprised that Izuku still held him in such regard after his past treatment of the guy.

All Might frowned for a moment, then said "Young Bakugo, I'm only telling you this secret because young Midoriya believes that you are trustworthy. I'll ask that you keep whatever I tell you here a secret. Amongst the students, only Izuku knows this and amongst the staff, only myself, principal Nezu and Recovery Girl know. So, can I trust that you'll abide by my conditions?" Bakugo squinted his eyes and stared right at All Might. He eventually said "Fine. If it's you who's asking, I can agree to that, All Might." All Might sighed "Good, I'm relieved to hear that. Let's start with this." Suddenly, the number one hero deflated in a puff of smoke, and Toshinori's skinny form was left in his place. Bakugo visibly recoiled and shouted, "What the heck!" Izuku walked over to Bakugo and made a hand gesture signaling to lower the volume "Kacchan, not so loud."

Bakugo pointed at All Might and asked, "What happened to you?!" Toshinori stood up from his chair and lifted his shirt, revealing his monstrous injury. Bakugo placed his hand over his mouth, almost gagging at the sight of it. After allowing the boy a few seconds to collect himself, All Might explained "This is an injury that I got from a villain a couple of years ago, he almost killed me. That said, I also managed to mortally wound him as well. Sadly, that monster got away from us." Bakugo was frightened "There's a villain out there who's on par with you?" Toshinori nodded.

The pro hero pointed at his stomach and continued "Due to this complication, I can only safely perform my hero duties for about 3 hours a day. The doctors have told me that anymore than that could put my life in danger. As the symbol of peace, I can't risk my untimely demise without ensuring that the world is left in good hands." All Might confidently looked at Izuku and Bakugo "That is why I accepted the principal's offer to work here at UA as a teacher." He solemnly turned to the boys and said "Young Bakugo, Izuku was indeed quirkless as you once knew, but I gave the boy my quirk. If we are being specific, I passed on my quirk to young Midoriya."

Bakugo immediately exploded "What?! You can pass on your quirk? Why did you pick useless Deku here?!" All Might shot an angry look at Bakugo, which made the blond-haired student cower. The hero explained "I chose Izuku because to me, he embodies the true spirit of heroism. You recall how he risked his well-being to save you during the sludge villain attack?" Bakugo hated to be reminded of the incident but nodded in understanding. Toshinori continued "I was originally going to choose one of the other students here at UA who already had a quirk, but after meeting young Midoriya here, I changed my mind."

All Might glanced at his successor, who was misty-eyed by all of the praise that All Might was giving him, the praise that his mother, classmates and peers all should have given to him when he was younger. The hero stated "I chose Izuku because my quirk One For All, is the combined power of all who have ever carried this torch. I am the 8th user of One For All and young Midoriya here is the current holder, the 9th." Bakugo was starting to put the pieces together. With a look of realization on his face, he asked All Might "You were like Deku, you used to be quirkless too, weren't you?" The number one hero told the boy "Yes, I was. My master who was the 7th holder of One For All, entrusted this quirk to me after she saw that I wanted to be a hero more than anything."

Bakugo finally asked "Why didn't you give your quirk to someone like me, or Todoroki or pony-tail Yaoyorozu?" All Might smiled at the question and plainly told Bakugo "Because none of you NEED it." Bakugo's face paled at the statement and he finally looked at Izuku since entering the room. The green-haired boy's face was a weird mixture of embarrassment, shame, and weakness. All Might continued "You all have such amazing quirks and other skills! Meanwhile, young Midoriya was put down by those around him merely because he lacked a quirk." All Might slammed his fist on the nearby table, startling the two boys "That isn't right, those aren't the sort of people that I give more than my all to save. We cannot look down on the quirkless simply because they don't have powers, that is discrimination."

Bakugo felt ashamed of himself, he pressed Izuku into getting All Might to explain things to him, even though it was none of his business. Doing something that felt very foreign to him, Bakugo turned to Izuku and clearly said "I'm sorry." Izuku blinked, not expecting to hear that from him "Huh?" Bakugo told them both "I'm guilty of messing with Deku because he didn't have a quirk. Everyone told me that I was special because I was born with an amazing quirk, and Deku was left behind because he didn't. Now, I find out that people can get quirks passed on to them, that's nuts." Bakugo pulled a nearby chair over to him and sat down, putting his hands on his knees "Don't worry you two, I'll keep this secret. I'm no blabbermouth and I figure that this information is really sensitive cause All Might's quirk is one of the strongest one's out there."

Bakugo remembered something else he wanted to ask, "How did you pass on One For All to Deku?" All Might supplied "One For All is transferred through the exchange of DNA, along with the consent of the current holder. I had to be willing to pass on my quirk to young Midoriya." Bakugo, now satisfied with the situation, walked towards the door. Before he exited, he said "All Might, I respect the hell out of you. You're our symbol of peace, the number one hero. If you believe that Deku is worthy of your power, I'm not going to argue. As for you Deku, now that I know this, we're rivals. We both always wanted to become heroes and now that you have a quirk, you might just do it. If you wanna be number one, just know that I'm shooting for the top spot too." Izuku, awed at the change in his friend, said "You got it Kacchan, Plus Ultra!" With Bakugo now headed home, Izuku told All Might "I'm really sorry, All Might! I saw that keeping this secret from Kacchan was causing problems and I wanted to fix that."

All Might grinned widely and placed his hand on his protégée's shoulder "That's quite alright, young Midoriya! Young Bakugo gave us his word that he'll keep things secret, and besides, if someday the truth of One For All were come out, you'll have people who know and can help you." Izuku smiled and said, "You always know just what to say, All Might." The hero countered "Not always young Midoriya, but I sure do try! HAHAHA!" Izuku headed to the door and said "Well, I guess I'll get going. See you after tomorrow!", he left the lounge and headed home.

Nascita Café, 8:00 PM

Sento was washing some dishes from the dinner that he and Misora had shared together. They had sat down to a delicious meal of grilled mackerel, tamagoyaki and rice. Misora had long since gone to the bathroom to shower, then to bed. The young genius took some time while rubbing a plate with a sponge and rinsing it off to think about the field trip. "I'll be sure to answer everyone's questions during tomorrow's trip. I'm glad that principal Nezu helped me draw up the Non-disclosure agreement forms, his work is very thorough!" Just as Sento finished putting away the now clean dishes and fixed up the café, he heard the bell ring as the front door opened.

The person who opened the door was Mr. Soichi Isurugi, better known to the community as Owner. He had a copy of the café's key on him and used it to get in. Owner saw Sento and greeted him "Yo, Sento! I see that you and Misora-chan have been running the café quite well." Sento shot Owner a look that came off a bit snarky and replied "Well I should think so, Owner. That second job of yours pretty much puts Misora and I in charge here." Owner smiled good-naturedly and said, "I'm very proud of you two, not only for running Nascita, but also for getting into UA and starting your hero team!"

Sento returned the smile and said "Thank you Owner, that means a lot! Also, Misora sends her thanks for the new jacket, she loves it!" Soichi rubbed his right hand behind his head and shyly said "Is that right, I'm glad that my little girl loved the jacket we both got her. By the way, thanks for helping me pick it out! I know next to nothing about fashion." Sento came up to Owner, placed a hand on the man's shoulder and said, "I only used the information that I got from listening to Misora on our dates."

At the mention of dates, Soichi adopted a smug look on his face and said, "So, you've been hanging on Misora-chan's every word, am I right?" Sento's face immediately turned bright red, he removed his hand from Soichi's shoulder and the young man quickly replied, "Of course I do, Misora is my girlfriend!" Soichi walked over to the counter and sat in one of the stools. He turned to Sento and told him in a father-like tone, "I'm glad that she is. She's got the nicest guy in the world looking after her." Sento got a bit misty-eyed after hearing the approval of his godfather, "I appreciate you saying that, Owner!"

Soichi then asked, "Is Misora-chan asleep? I noticed that she isn't here with you." Sento told him, "Yeah, she wanted to turn in early for a field trip we have tomorrow." Curious about this, Owner asked, "Oh? Where are you guys going?" Sento excitedly replied, "I got Aizawa-sensei to agree to have the field trip at the Institute! Incidentally, one of the first-years from class 1-A who will be joining us seems to be quite the curious guy!" Soichi seemed interested in what Sento was saying, "Well, who's this guy you seem so impressed by?" Sento answered, "His name is Izuku Midoriya. I gave him a hand today when class 1-A were taking the quirk assessment test. He had several questions about my quirk and the Build Driver."

Owner asked Sento, "You going to have the students sign a Non-disclosure agreement, right?" Soichi removed his glasses from his face and placed them on the counter in a rare moment of seriousness and continued, "We can't have either Hokuto or Seito get their hands on the Rider System, much less the Pandora Box itself. It would be utter chaos." Sento sat in the stool next to Owner and said, "I agree, but principal Nezu and UA's teachers assured me that class 1-A will keep this a secret. I mean, if we can't trust the next generation to take care of things, then what's the point?" Soichi grinned and said, "That's true enough!"

Owner then stood up and asked, "Say Sento-kun, would it be alright if I were to come along on your little field trip?" Sento gawked at the request and asked, "Why? Aren't you busy with your second job?" Soichi flicked his hat and said, "I've got a few vacation days saved up, so why not use one tomorrow so I can meet these future heroes that you seem to think so highly of?" Sento asked, "You're absolutely sure?" Owner pretended to be put off by Sento's question, clenched his heart and said, "Ah! Little Sento seems to not want his dear old godfather to embarrass him in front of his juniors!"

Sento held his hands up in appeasement and told Owner, "No, that's not it. You're more than welcome to join us, Owner!" Soichi then clapped his hands and proclaimed, "Bravo! It'd be fun to see how the Institute is progressing. I can hardly wait to see Takumi, Banjo, Kasumi and the other employees! We'll make a day of it." Sento laughed and told the man, "Sure, why not? Tomorrow is supposed to be fun and educational anyways." Sento looked over at the clock, which now read 8:50 PM and said, "We depart from UA by bus. We have to be at UA's front gate by 8:50 AM, then we'll head for the Institute at 9 AM after Eraserhead has made sure that everyone is on board."

Sento yawned and told Owner, "Anyways, it's getting late and I'm going to turn in. Good night, Owner!" Mr. Isurugi waved to Sento and said, "Good night, Sento."

Front Gate, 8:30 AM, UA High School

Sento, Misora and Soichi were waiting by the front gate. They had breakfast, then immediately rushed off to UA. They didn't want to show up late. Misora turned to her father and happily said, "Wow Dad, I'm happy that you decided to use one of your vacation days to go on the field trip with us!" Soichi smiled at Misora and replied "It sounded like too much fun for me not to go! Plus, I get to spend the day with my favorite people in the world, sounds like a vacation to me!" Misora hugged her father and said, "I think so too!"

The trio then heard a gruff voice call out, "Well, look who's here bright and early." They turned their heads to be met with the sight of Shota Aizawa aka Eraserhead. Sento approached the teacher and greeted, "Good morning, Aizawa-sensei! How's everything going?" Eraserhead smirked at the question "Preparations are complete for the trip, if that's what you mean." Eraserhead turned his attention to Soichi and asked, "Who's the gentlemen you've both brought with you?" Owner walked up to the pro hero and introduced himself, "Yo! I'm Soichi Isurugi. I'm Misora-chan's father. I'm coming along on this trip to keep Sento and my daughter company. I hope that isn't any inconvenience?"

Eraserhead bluntly responded, "No inconvenience at all." Soichi then held out his right hand, offering a handshake. Aizawa looked the man wearily for a moment, before mimicking Soichi's gesture and shaking the man's hand. Just then, Ryuga Banjo and Kasumi Ogura had arrived, carrying their backpacks and a few snacks and other necessities. Misora quickly ran up to her best friend, gave her a big hug, and squealed, "Kasumi-chan! Good morning! I'm so glad to see you and Banjo!" Kasumi returned Misora's affectionate hug and said, "You too, Misora-chan! We're really excited for the trip, aren't we Ryuga?"

Banjo nodded in agreement with his girlfriend, "Yup! Today's going to be awesome!" Sento approached his muscle-bound friend and told him, "I agree, Banjo. This will be an excellent opportunity to educate our underclassmen, as well as show them around the Institute!" Banjo then took notice of Soichi and greeted him, "Hey there, Owner! What are you doing here?" Soichi smirked at the young man, telling him, "Well Banjo, I had some vacation days saved up from my other job, so I decided to use one today to go on this field trip with you all! Hope I'm not intruding?" Banjo grinned and said, "No complaints here!"

A few minutes later, some of class 1-A's students began to show up. Izuku and Momo were the first ones to arrive. Seeing the Build crew talking to one another in front of the school bus, the two first-years approached their seniors. Izuku waved at them and said, "Hello, Sento-senpai! Misora, Banjo, and Kasumi-senpai too! I hope that you're all having a good day so far!" Sento was the first to greet the younger boy, "Yes, we are! I hope you're ready to visit the Institute, Izuku!" The green-haired student answered, "Of course! The Touto Institute of Advanced Matter Physics is one of the most renowned research facilities in the whole world! The only other places that come close are I-Island and Seito University Hospital!" As Izuku continued to mutter his thoughts to Sento, who was eagerly listening to his fellow UA student, Momo walked over to Banjo, Kasumi and Misora commenting, "Goodness, Midoriya-san seems to get quite excited when talking about science-related topics! Not that I cannot relate."

Misora nodded at Momo's statement and said, "Don't worry Momo-chan, Sento is the same way! Whenever he gets a new idea in that bright head of his, I have to bring him back to reality or else, he'll just spend the entire day thinking about Physics equations." At the mention of Physics, Momo perked up "Will we be seeing some of Sento-senpai's ideas at the Institute?" Misora mimicked a zipping motion across her mouth and told Momo, "Maybe, but you'll have to wait until we get there. Can't spoil the surprise after all!" Momo pouted a little but understood the older girl's reasoning.

Ochako and Tenya were the next class 1-A students to arrive at the front gate. Ochako saw Izuku talking up a storm with Sento, who was also contributing to the conversation. Both appeared to be quite excited to have someone to exchange ideas with. The brown-haired girl had an idea to get Izuku's attention. She slowly approached the two, with Tenya looking confused at his new friend's actions. She eventually decided to sneak behind Izuku. Sento noticed her approaching, then turned his head to the rest of the Build crew. Misora had her index finger extended over her lips, suggesting that he not interrupt whatever Ochako was about to do. Banjo had his hands behind his head and whistled, pretending not to see anything. Kasumi gave him a thumbs-up and Momo simply closed her eyes and smiled.

Turning back to Izuku, Sento stopped the boy mid-conversation and pointed up, "What's that up there?!" Izuku looked up asking, "Huh? I don't see anything." Suddenly, two hands covered Izuku's eyes and the person responsible asked, "Guess who?" Izuku blushed a bright red after hearing the familiar female voice and answered, "Is that you, Uraraka-san?" Ochako then removed her hands. Izuku turned to face his friend and she smiled, "Yep! It's me, Deku-kun!" Izuku smiled at Ochako and said, "You got me, Uraraka-san!" Ochako gave Izuku a peace sign with her fingers. Tenya had chosen to now walk up to his friends. He greeted Izuku "Midoriya-kun, I hope that you weren't too startled by Uraraka-kun's stealthy surprise."

Izuku replied "No worries, Iida-kun! I'm so excited for this trip, that even Uraraka-san's greeting didn't spook me too much." Satisfied with his friend's response, Iida adjusted his glasses on his face and said "Very good. Having such nerves of steel will definitely be of help to you in the future. I'm sure of it!" Izuku nodded at what Tenya had said. As the rest of class 1-A's students began to arrive, Aizawa was ushering them over to fill up the bus that would take them to the Institute. The Build crew plus Soichi got the frontmost seats behind Eraserhead, who was driving the bus. Behind them were Izuku, who sat next to Ochako, Tenya who sat next to Tokoyami, Todoroki next to Momo, and so on.

It was 8:50 AM and Aizawa turned to Sento "Alright Sento, since this trip was your idea, it seems only fair that you take care of things from here." Sento replied "Of course, Aizawa-sensei!" Sento stood up from his spot next to Misora to the aisle between the bus seats. He cleared his throat and addressed class 1-A "Good Morning, class 1-A! By now, you all know me as Sento Kiryu. Aizawa-sensei has placed me in charge of today's activities. Our field trip today will be taking place at the Touto Institute of Advanced Matter Physics." Sento reached into his bag and pulled out a stack of papers. He then began to pass out a copy of the papers to all of the 1-A students.

Bakugo questioned "Oi! What's this paper that you're handing us?" Sento looked right at Bakugo and said "That Bakugo, is a Non-disclosure agreement form that I'm having you and the rest of class 1-A sign before we reach the Institute." Mina Ashido raised her hand and shouted "Sento-senpai!" Sento asked "Yes, Ms. Ashido?" Mina asked the genius "Why do we have to sign these papers?" Sento closed his eyes, crossed his arms behind his back and answered "I'm having you all sign this as during today's field trip to the Institute, you will see technology, inventions, and information that we do not want to fall into the wrong hands. As students of UA High, we are expected to act in a manner that benefits society."

Izuku chose then to raise his hands to ask his own question "Sento-senpai! Does that mean that you're going to reveal information about the Nebula Gas quirk that you, Misora and Banjo-senpai share?" Sento nodded in confirmation "Yes Izuku, by the end of our trip, you will all know the inner workings of the quirk. That is why we are requiring you to sign the agreement, promising that none of you openly tell anyone about what you see at the Institute with permission." Izuku supplied "Don't worry, I'm sure that no one here would tell a soul." As if to confirm what Izuku had said, all of the students pulled out pens from their backpacks and signed the agreements, returning the signed forms to Sento.

Sento gave a curt bow and thanked the class "Myself and the rest of the Build crew really appreciate this." Misora chimed in "Yes, I know that you are all trustworthy." Banjo spoke up "You guys are going to love the place!" Kasumi added "We hope that you all have a wonderful time!"

The bus had arrived at the Institute. The students had left the bus and were standing in front of the building. Everyone from class 1-A were astounded at the impressiveness of the Institute. It was a very tall white building with many glass windows. There were many smaller buildings surrounding it, facilities like a garage for cars, a gym for healthy exercise, a warehouse for machinery and much more. Todoroki asked Sento "Does this whole Institute really belong to you?" Sento gave Shoto a solemn smile and told him "Yeah, my parents were the previous heads of the Institute. They left it all to me before they died."

Misora gave Sento a worried look, before Sento quickly shook off the negative feeling and smiled at her. Sento then walked up to the front door of the Institute in front of class 1-A, with Misora, Banjo, Kasumi and Soichi beside him. Eraserhead stood behind the class 1-A students with his arms crossed, more than happy to allow Sento to be responsible for the field trip taking place at the boy's company. Just as Sento was about to begin the tour, Izuku had taken notice of Soichi and asked him "Excuse me, Sento-senpai? Who is that gentlemen standing over there with you guys?" Sento blinked and remembered that he never did introduce Owner to class 1-A. He responded "Ah yes, how silly of me! This man over here is my Godfather, Misora's father, former astronaut and Vice-Director of the Touto Institute of Advanced Matter Physics, Mr. Soichi Isurugi!"

After the stellar introduction, Soichi had stepped forward and tipped his hat up a bit as a greeting. He addressed the first-year students "Yo! Just as Sento explained, my name is Soichi. I decided to tag along on this field trip as I had some vacation days from my second job, and I figured that I'd spend the day with my Misora-chan, Sento-kun, and see how the Institute is doing." Most of class 1-A had seen Soichi as an excitable and fun guy. The only ones who were skeptical were Izuku, Shoto, Bakugo, and Aizawa. Izuku thought to himself "I'm getting a weird feeling from Mr. Isurugi, I hope that it's nothing bad."

With the introductions out of the way, Sento began the tour "Welcome to the Touto Institute, class 1-A of UA! We hope that you enjoy the trip and more importantly, you all learn something during the tour!" Izuku looked estatic for the tour. Ochako, Momo, Mina and Tooru jumped up and down in excitement, while Tsuyu and Jiro were more reserved in showing their interest. Kirishima and Kaminari looked pumped, Shoto and Bakugo were eager to see the facility, and the rest of the boys were ready for the trip to start. Sento and the Build crew approached the front door and Sento said "Now, without further ado, let us begin the tour!"

(Steins;Gate [VN] OST – Laboratory starts playing)

As the students entered the Institute, they were met with the sight of the inside of the building. They had entered the Research area via the side entrance. There were numerous scientists wearing white lab coats, jotting down notes on the clipboards they were holding. The employees of the Institute had taken notice of Sento and his guests and turned to face them. Taizo, one of the researchers, had approached the Build crew and class 1-A to greet them. He stretched out his hand to Sento and said "Good Morning Sento! It's been quite a while since we've last seen you!" Taizo turned to Misora, Soichi, Banjo and Kasumi and greeted them too "Ah Misora-chan! Vice-Director Soichi-san! Banjo-kun and Kasumi-chan as well! A good morning to you all too!" Soichi waved at the employee "Yo Taizo-kun, I trust that the Institute has been well cared for in our absence?"

Taizo nodded and explained "Yes, ever since Sento entrusted the Directorship to Takumi-kun, research and development has never been more promising!" Taizo had then noticed UA's class 1-A students and the pro hero Eraserhead were present and he recalled "Oh, that's right! Today is the field trip that Sento informed us about! Well, allow me to offer my services as your tour guid…" Before Taizo could finish his sentence, a male voice spoke up "Don't worry, I'll be the one to lead the tour." Everyone present turned to see who had said that and they were all met with the Co-Director of the Touto Institute of Advanced Matter Physics, Takumi Katsuragi. He was wearing the same type of lab coat as the employees, with the difference that he also had a pair of lab goggles hanging from his neck and blue latex gloves on his hands.

Sento was quick to welcome his friend "Hello Takumi! Are you sure that leading the tour won't take time away from our research?" Takumi smiled openly at Sento and company proclaiming "No actually, we've been making great strides and you just so happened to catch us on a slow day. I'm more than happy to help you show the UA first-years the Institute!" Takumi then walked over to class 1-A and introduced himself "Hello UA freshmen! My name is Takumi Katsuragi, Co-Director of the Touto Institute of Advanced Matter Physics alongside Sento Kiryu. I will be showing you all around the facility, so if any of you have any questions, feel free to ask them! Also, Taizo, you may return to your electromagnetic pulse experiments." Taizo saluted Takumi and Sento and answered "Yes sir! Much appreciated!"

Tooru Hagaku was the first to raise her arm up to ask a question. Takumi took notice of the invisible girl, he pointed to her and asked "Yes, you have a question miss…?" Tooru waved her arms in an excited fashion and said "Hi! I'm Tooru Hagakure! My question is how come you're running the Institute if Sento-senpai is the Director?" Takumi elaborated "Sento named me Co-Director shortly before he, Banjo and Misora took their entrance exam. He appointed me Acting Director due to his enrollment at UA and his budding hero career as leader of the Build crew. Does that answer your question, miss Hagakure?" The invisible girl seemed to have nodded and answered "Yes, thank you!"

Takumi turned to address the rest of class 1-A and asked, "Does anyone else have a question that they would like to ask?" Izuku was next to raise his hand with a question. Takumi noticed the young man and said "Ah, you must be Izuku Midoriya. Sento's description of you was spot-on. Now, what is your question, Izuku?" The green-haired hero hopeful posed a serious question "Are we going to find out how Sento, Misora, and Banjo-senpai's Nebula Gas quirk works?" Takumi thinned his lip at what Izuku had asked him. Takumi looked to Sento, with the latter nodding his head as though to affirm what Izuku had asked. Takumi told the class "Yes, at the end of today's tour of the Institute, you will all be made privy to the secret behind the Nebula Gas quirk. However, I would remind you all that having signed the non-disclosure agreements means that none of you are to openly share the knowledge you will receive, correct?"

All of class 1-A nodded in confirmation. Takumi clapped his hands together and said "Good! Now Sento, I'll be leading the tour, but you are ultimately in charge of the field trip." Sento exclaimed "Of course, Takumi! Lead the way!" Takumi instructed the group to follow him further into the Institute. He first led them to the Institute's front desk. Mina Ashido was put off by this and asked Takumi "Oi! What are we doing at some boring old welcome center?" Kasumi was the one to answer Mina's question "Actually, I run the welcome center and the front desk as the Institute's secretary!" Mina looked gob smacked and said "Seriously?! Kasumi-senpai, you're just a year older than us! How do you fit in a job along with going to UA?"

Banjo took the liberty of clearing up Kasumi's workload "Kasumi's REALLY smart, like almost as smart as Sento, Takumi and even principal Nezu! She set up this cool program that lets her manage all the Institute's records from her phone! She doesn't even have to be in the building, so she can attend UA and help us set up our hero agency!" Everyone except for Eraserhead, Sento, Banjo, Misora, Kasumi, Takumi and Soichi were shocked by Banjo's statement. Kyoka proceeded to follow Mina's question with one of her own "What exactly is Kasumi responsible for here at the Institute?"

Takumi looked over to Sento and asked, "Would you care to answer her, Sento?" Sento straightened himself up, making Misora giggle "Can do! You see miss Jiro, Kasumi's place in Touto Institute of Advanced Matter Physics is a crucial one." Sento glanced in the direction of the research center they had just come from "With the time it used to take for myself and now Takumi to organize and lead the facility and all the research projects, the paperwork used to be quite the issue. One of the research groups would finish their assigned experiment, only to be left with the aftermath of having to write up a report and then file it away. After I hired Kasumi as our secretary, her excellent organizational skills made filing the lab reports, finance reports, and company records a breeze!"

A light blush formed on Kasumi's face after hearing the guys praise her abilities "Geez fellas, you sure know how to flatter a girl." Takumi added "Sento and Banjo are correct Kasumi, your presence at Touto Institute has been nothing but a boon to us. Time that would have been spent filing away reports can now be put toward advancing our research into the fields of science and generating profit to sustain the company. I am most happy that Sento hired both you and Banjo." Banjo then spoke up and said "Takumi, show them the testing center!" Takumi knew the reason why Banjo wanted them all to go there, and he coolly said, "Of course Banjo, that is where we are headed next."

The whole of class 1-A tilted their heads in confusion at the grin that Banjo was sporting after bringing up their next destination. Out of curiosity, Shoji asked "Excuse me, could I please inquire what this "testing center" is exactly?" Misora asked Sento "Oh! Could I answer this one?" Sento smiled at his eager girlfriend and nodded. Misora turned to Shoji and the rest of the class and explained "See, the testing center is where the finished experiments go for their final test. Banjo is our tester, as his physical strength makes him the best person to push our inventions to the limit."

Takumi then motioned with his hand for everyone to follow and said "Misora is correct by all counts, now everyone please follow me."

(Music stops playing)

Takumi and Sento led the curious class 1-A to the testing center. The room was filled with several punching bags being hung from the ceiling, mangled and dented experiments like robots and suits in the corner of the room, and a large metal lab table on which to conduct experiments.

(Haikyuu! OST - Haikyuu! starts playing)

Takumi then gestured his hand over towards Banjo and asked, "Well seeing as the testing center is mainly your facility, would you care to show the students what we do in here, Banjo?" Banjo grinned widely, walked over to the middle of the room in front of the group and said "Sure!"

Banjo punched his right hand balled up in a fist into his left hand. He excitedly exclaimed "Welcome to the testing center guys! This is where Sento and Takumi have me help them test the durability and physical limits of every experiment that comes out of the Institute." Banjo walks up to one of the punching bags and punches it so hard, the bag exploded. The entirety of class 1-A is amazed, with Kirishima yelling "Holy crap, Banjo-senpai! I knew that you were strong, but you just blew up that bag like it was nothing!" Sento explained to everyone present "Banjo was already a very strong individual before he got a quirk. Now that he has one, it makes sense that his already naturally-high strength would increase further. That makes Banjo the perfect person to ensure that our creations can withstand damage from those weaker than Banjo himself."

Takumi was adding notes to the paper he had affixed to his clipboard and began muttering "So, Banjo's immense physical strength can still obliterate our high-grade punching bags. Maybe if we were to use a more durable material? The ones we employ are made of a unique carbon-fiber. If the next bags were to be composed of a 50/50 ratio of leather and silicone, and filled with ground iron as opposed to sand…" Most of class 1-A were surprised to see Takumi muttering and behaving very much like a certain green-haired boy they all know. Ochako saw this and bluntly commented "Wow! Takumi sure is acting a lot like Deku-kun, huh?"

Takumi then set aside his thoughts about strengthening the punching bags and asked Banjo "Banjo, could you do a demonstration test for the class? I have a new suit that I would like to test." Banjo did some arm stretches and said "Of course! Let's see what you got today!" Takumi wheeled out a dummy that was fitted with what appeared to be a silver-colored protective suit (Think of the Avengers suit from Endgame, except with the Build logo where the Avengers logo would have been). Tenya asked Takumi "Is that some sort of protective equipment?" Takumi grinned at Tenya's question and answered "Yes, good eye Tenya! We are testing the functionality of a prototype hero suit that can stand up to most physical forces, gunfire, and even fire as it is partially composed of Tungsten."

Takumi directed "Now everyone, please step back and let Banjo show you the effectiveness of our latest model suit." The class, Eraserhead, and the Build crew plus Soichi all took a few steps back so that they were all near the room's front door. Takumi looked to Kasumi and told her, "Well, Ms. Ogura, please give your boyfriend the good ahead." Kasumi nodded and did just that "Ryuga! You're clear to test!"

Banjo smiled and replied, "Thanks Kasumi!" The muscle-head turned to the training dummy and threw a fiercely strong punch that sent it flying across the room. Takumi was quick to inspect the suit after the blunt force test. Surprised, Takumi shared with everyone present "Oh my! This is the first suit design that Banjo hasn't been able to dent! This test was a huge success!" Takumi turned to Banjo with his hand raised out for a fist bump "We couldn't have done this without your cooperation, thank you Banjo!" Banjo eagerly bumped fists with Takumi and said, "Happy to help dude!"

Soichi told everyone present "You see everyone, that suit was a collaboration between Sento, Takumi, Misora, Kasumi, Banjo and even yours truly. We all contributed to its development in some shape or form. Sento, Takumi and Kasumi agreed upon the materials that would compose the suit, Misora and I helped with the suit's design, and Banjo here would break all of the previous models in order for us to rebuild it with the intent to better it the next time. In fact, the original design of the suit was thought up by Sento's parents, Shinobu and Kyoka Kiryu."

(Music stops playing)

Jiro turned to Sento and calmly asked "Your mom's name was Kyoka like me?" Sento smiled wanly and told her "Yeah, funny that you and she share the same name." Misora had noticed that Sento's mood was going down at the mention of his deceased mother and she took his hand into her own. Surprised, Sento gazed at his beloved girlfriend. Misora lovingly said "It's okay, Sento. I'm sure that Uncle Shinobu and Aunt Kyoka are very proud of you!" Sento tightened his grip on Misora's hand and happily replied "You're right! I needed to hear that, thanks Misora." Misora leaned in close to Sento and pecked him on the cheek, causing all the class 1-A female students to squeal out of sheer cuteness. Misora gently told her boyfriend "I've always got your back."

Ochako had been blushing for a good while since Misora had kissed Sento. As she was standing next to Izuku, she mindlessly blurted "Uh, I guess that when you love someone like that, there isn't anything you wouldn't do for them. Isn't that right, Deku-kun?" Izuku stiffened at the unexpected question that was thrown his way, rubbed the back of his head and said "Well, I'm not familiar with THAT kind of love. After all, I've never had a girlfriend." Ochako replied "Is that right?" Internally however, Ochako was elated "Oh man! Deku-kun is single! Relax girl, remember why you're attending UA! For now, we can be good friends. Maybe more if things improve."

Takumi announced, "Okay everyone, Sento will now lead us for the reminder of the tour as he can best explain the areas that are left to see." Sento stepped forward and with a huge smile on his face, exclaimed "Alright, let's continue with the tour, shall we?"

(Kamen Rider Build Soundtrack CD1 04 Sento's room starts playing)

Sento led the group around the rest of the Institute. He showed them all the indoor gym that the staff use for exercise and to destress. Banjo had enthusiastically shown Izuku, Todoroki, Bakugo, Kirishima and the rest of the male students who were interested, all the gym equipment. He and Kirishima had challenged each other to contest of who could lift the most weight. Both boys, as well as everybody minus Bakugo, were surprised when Izuku had joined them in their lifting and was keeping pace with the muscleheads. Ochako was not so subtly drooling over Izuku's ripped biceps as he was doing bicep curls.

Misora, Kasumi, Mina, Asui, and Tooru all winked at Ochako and gave her a thumbs-up, causing the poor gravity girl's face to erupt in a bright red blush and wave her arms in front of her face crying out "It's not what it looks like!"

The next area of the Institute that Sento had led the group to was the Cafeteria/Kitchen. Eraserhead and the class 1-A students were beyond impressed with how fancy and clean the place was. Even Momo, who is accustomed to a higher standard of living remarked "Goodness, this kitchen is even nicer than the ones we have back at the mansion!" Misora smiled widely and told the group "That's because Sento personally handled the reconstruction of this area! He drew up an initial design for the builders, and even helped to make this kitchen!" There was a stainless-steel buffet counter with various foods, deserts, and drinks. In the back of the room, was the cooking area, complete with several ovens, stove-tops, a brick pizza oven, deep fryers, food processors, and every type of kitchen equipment imaginable.

Sento gave the group a short bow, much like a butler would. He presented the facility "Here, is the Cafeteria/Kitchen area of Touto Institute! As the company makes quite a bit of money from our various projects, we are able to fully stock the kitchen to suit the needs and tastes of our beloved staff members. I helped to remodel this room to include a cafeteria, for occasions such as today where we are receiving guests!" Sento had taken notice of the starry-eyed freshmen and the hungry looks on their faces. The genius chuckled slightly and told them "After we've finished the tour, we will be returning here for lunch. It's all free, of course! Only the best for UA's newest future heroes, after all!"

Class 1-A yelled out "All right!" Aizawa blinked and asked the young director "Yo Sento, are you sure about that? From what I can see, some of these kids can put away quite a bit of food." The scruffy underground hero put both his hands into his pants pockets and managed to get out "You sure that it won't be a problem?" Banjo spoke up "It's all good, Aizawa-sensei! Sento and Takumi put enough of the budget towards the cafeteria to feed a small army! You should have seen some of the lunches that Kasumi and I eat when we're here at work!" Kasumi stepped forward so that she was standing next to Banjo, in front of Eraserhead "Ryuga is absolutely right! The Institute's kitchen can easily handle feeding us all and then some! The first time that we ate here, Sento treated us to a nice lunch that I could have sworn came out of a five-star restaurant!"

Sento raised his right fist to his chest and told his teacher "Don't worry Aizawa-sensei, our kitchen is perfectly capable of meeting everyone's nutritional needs!" Momo then shyly asked the Build crew "Um, do you think that you could meet my dietary requirements then? Due to my quirk Creation, I can create objects by using the fat in my body as fuel. This means that I must consume much more food than the average person." Misora clasped Momo's hands and told her "Don't you worry! Sento can make anything, whether it's an invention or food! We'll make you that you're well fed, Momo-chan!" Momo shot Misora a look of relief and gratitude and said, "I'm very grateful, Misora-senpai." Misora shook her head and correctly the black-haired rich girl "We're friends now, so call me Misora-chan!" Momo began to stammer "Oh gracious, I simply couldn't! You belong to class 2-A, which makes you my senior. I must show you the proper respect!" Misora good-naturedly stuck out her tongue and told Momo "You can respect me just fine as my friend!" Momo composed herself and said "Okay then, Misora-chan."

Misora hugged the creation girl and called out to Kasumi and the other class 1-A girls to discuss all manner of things like food, fashion, favorite heroes, etc.

Sento then led the group to the planetarium that was housed in the center of the Institute's main building. Izuku was soaking in the vibe of outer space that the room was giving off. The room consisted of models of the planets in Earth's solar system. There was the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. The Earth's Moon was also featured among the models, next to the Earth. Izuku, Ochako, Momo, Aoyama, and the rest of class 1-A were amazed by the exhibit. Takumi, who was standing by the light switch near the entrance, turned off the lights. A projector that was mounted on the ceiling lit up and put a starry night sky all over the room. It made everyone present feel as though they were all really in outer space. Soichi in particular, was looking at the model of planet Mars with a strange glint in his eyes, that went unnoticed to everyone present.

Finally, Sento brought the group to the last leg of the field trip at the Institute. The room that everyone had entered was mostly white in color. What stood out the most in the room was the large machine in the back that had what looked like a microwave attached to it. To the right of the contraption, was a workbench with blueprints of inventions and random ideas and equations on paper scattered across it. The Drill Crusher was also on the workbench as well as an orange and black colored gatling gun. There was also a black chamber with a square glass window on it over by the large machine. The main attraction however, was the unique black box that was on a stand opposite the workbench, being shielded by a glass case.

Sento spread his arms out in front the room and proudly exclaimed "Here we are! The last area on the tour, my personal laboratory!" Izuku had noticed the box that was in the glass case and asked "Sento-senpai! Is that the Pandora Box?"

(Music stops playing)

(Kamen Rider Build Soundtrack CD1 37 The Pandora Box starts playing)

Takumi was the one who answered Izuku instead "Indeed Izuku, beneath that glass case is one of the single most important objects in the world, the Pandora Box." Mina raised her hand to ask, "Wait a sec, what's so special about that box?" Sento decided that it was time to drop the bomb "Well for starters, the Pandora Box is the source of the quirk Banjo, Misora and myself all share, Nebula Gas!" The class 1-A freshmen collectively lost it at that point and they all shouted out "WHAT!?" Brushing off the confusion in the room, Sento continued "Maybe I should explain things a bit better."

Sento walked over to the stand where the Pandora Box was placed and put his hand on top of the glass case. Sento began "Everything started when my parents, who were the Institute's first Directors, created the Touto Institute of Advanced Matter Physics." The young genius turned his gaze to the portrait of his parents that was mounted on the wall behind the Pandora Box. It showed Shinobu and Kyoka Kiryu standing happily in front of the Institute with Kyoka carefully holding a 1-year old baby Sento in her arms.

Sento explained "My parents founded the Institute with the help of many of the scientists you all saw working in the Research area, as well as our board advisors who many of which were very close to my mother and father." He gestured over to Soichi and told everyone "But the person on the board who was the closest to them was Mr. Soichi Isurugi, who is Misora's dad, my godfather, and a dearly valued family friend who has helped us for many years!" Soichi took his fedora off his head and placed it over his chest and said, "Don't forget that I'm also the Vice-Director under you and Takumi-kun!"

Sento grinned and playfully said "Of course not, Owner!" Rikido Sato raised his hand, with a question ready "Excuse me, Sento-senpai? Why do you guys call Mr. Isurugi Owner?" Sento readily responded "Well Sato, we refer to him as Owner because he is the owner of the café Nascita, where he, Misora and I work. It's also our home. All of our customers also call him Owner as well, likely due to the great service we provide them." Sero then hurriedly asked "Wow, you own the Institute, work at a café, and attend UA? How do you find the time to handle all of that?"

Sento casually addressed the question "Well, I appointed Takumi as Acting Director of the Institute to free up time, so I could attend UA. As for the café, Misora and I run it now as Owner's second job keeps him quite busy. He helps when he is there though. Ironically enough, due to the Build crew's growing popularity as a hero team, the café is now often filled with fans who want to meet us and end up as customers after looking at what we serve."

Sento briefly glanced over towards Banjo and Kasumi and remarked "Banjo and Kasumi help out at the café every now and then, and we reward them with suitable pay and free food!" Misora then clapped her hands together and said, "You're all welcome to visit the café whenever you'd like!"

Sento resumed his explanation about the Pandora Box "Back to business! See, Owner was an astronaut 10 years ago, and my parents and the Institute had him embark on a trip to Mars." Eraserhead turned to Soichi and commented "Huh looking at you now, I wouldn't have ever guessed that you were a former astronaut, Mr. Isurugi." Soichi merely smiled in a placid manner and said, "I've done a lot with my life, not everything is worth mentioning." Eraserhead simply looked back to Sento, as he continued his explanation.

Sento stated "Owner discovered the Pandora Box among some ancient Martian ruins, presumably from a dead civilization. He brought it and other objects that he found there back to Earth." Sento then pointed to Misora's wrist and said, "That gold bracelet around Misora's wrist was one of the items he brought back, he gifted it to her as a souvenir from the trip." Sento grimaced a bit and carefully explained "After the Pandora Box was brought to Earth, Owner gave the Box to my parents as he felt that they were the best people to unlock its secrets. This didn't sit well with the Hokuto and Seito prime ministers as they had helped to fund the shuttle launch."

The genius raised his right index finger to his temple and continued "During this, my parents had discovered 60 unique bottles that were affixed to the panels of the box, 10 bottles per panel. These were the fullbottles that you all witnessed Banjo, Misora and I use the other day during the quirk assessment test. Touto's prime minister Taizan Himuro decided to give 20 fullbottles to Hokuto, 20 to Seito, and keep 20 of them for ourselves as an act of fairness. It was also a sort of challenge to see which region could collect all 60 and solve the Pandora Box's mystery."

"However, during the distribution of the bottles, some rogue villain attempted to steal all 60 fullbottles before they could be given to the prime ministers. The thief had been too hasty in trying to steal the bottles and had ended up knocked a few of them over. The essences within some of the bottles were scattered across Japan. Afterwards, the bottles were still given away as well as the empty ones, as the essences could still be recovered."

Sento proudly said "In fact, two of those essences, the Rabbit and Tank, found their way inside of me as my parents later discovered. Banjo also had the essence of the Dragon find him as well. Those were placed back inside of their empty bottles and were restored. The Pandora Box produces a substance we call Nebula Gas. Incidentally, that is also the name of our quirk. My parents discovered that enough exposure to the Nebula Gas would grant a person the quirk." Sento walked over to the whiteboard and grabbed a black marker. He drew the Pandora Box, then an arrow pointing to a gaseous cloud, then an arrow pointing to a gas chamber, an arrow which pointed to the Rabbit and Tank fullbottles, and finally, an arrow pointing to the Build Driver and Kamen Rider Build standing next to it.

Sento elaborated on his drawings "This process is quite simple. First, one must have either the whole Pandora Box or at least one of the Panels in their possession in order to produce Nebula Gas. Second, the subject then enters a special gas chamber that will introduce the Nebula Gas into their system. This step usually requires a full 24 hours for the gas to be fully absorbed into the host. Afterwards, the formerly quirkless individual should find themselves now in possession of the Nebula Gas quirk! This is a huge accomplishment as my parents discovered proof that quirks exist outside of planet Earth!"

Misora placed her closed hand over her mouth and coughed, signaling Sento to get back on track. The young intellect resumed "Back to the process, simply having Nebula Gas isn't enough on its own. The quirk's true power showcases itself when one utilizes the Rider System" Sento drew the Build logo in the center of his diagram on the whiteboard. He shared with the group "Before they passed away, my parents devised what would become the beginning of the Build Rider System. A method which would allow a Nebula Gas quirk user to reach their full potential. You see, Nebula Gas is a transformation-type quirk and to transform with it, one needs a Build Driver." Sento held out his own Build Driver and showed it to the group.

Todoroki then raised his hand and asked, "Your folks built the Driver, correct?" Sento grinned at the boy's question and answered "Correct!" He placed the Driver on his waist, causing the belt straps hold the Driver in place. He then grabbed the Rabbit and Tank fullbottles from his coat pocket and shook them up and down. He explained "Normally, one transforms into a Kamen Rider by matching an organic fullbottle like Rabbit with its inorganic match, in this case the Tank fullbottle. This results in a Best Match, where the bottles synergize with each other and produce a stronger form than if the bottles didn't match. Once that's done,"

Sento placed the bottles in the Driver:

RABBIT!

TANK!

BEST MATCH!

Sento turned the Vortex Lever on the Driver, making the two halfbodies, one red and the other blue appear. The Driver then asked:

ARE YOU READY?

Sento posed and said "Henshin!" The halfbodies snapped together, encasing Sento in armor. The Driver announced:

FULLMETAL MOONSAULT!

RABBIT! TANK!

YEAH!

In front of the students and company, was Kamen Rider Build. Sento finished with "To use the Build Driver, one must have a high enough Hazard Level. This is a measure of how much resistance to the Nebula Gas a person has. The Build Driver requires that a Nebula Gas user has a Hazard Level of at least 3.0." Sento concluded his explanation of the Pandora Box and the Rider System by disengaging his transformation and asked the class 1-A students "Any questions?"

Each one of them shot a hand up into the air, eager to ask some questions of the young physicist. Seeing how rowdy everyone was being and have noted the looks of amusement on Banjo, Kasumi, Soichi and Misora's faces, Sento opted to implement a simple solution. He shouted "Everyone can ask me one question each, and then we'll end the trip with that lunch I promised you all! Does that sound fair?" The students all nodded in agreement. Sento sighed "Good. Let's start with the girls. Now first up, let's hear from Ochako." The gravity girl shyly asked "Is the Institute currently hiring? My quirk is Zero Gravity, I can make people and objects virtually weightless. The only drawback is that if I push it too much, I get nauseous. I was hoping to maybe apply to be a tester like Banjo-senpai! I really need to make some extra cash, and this seems like a great place!"

A lock of Sento's hair popped out due to his eagerness after hearing Ochako's plea. It settled back into place and Sento told Takumi "Takumi, you hire this girl immediately! I like her attitude!" Takumi chuckled and told his Co-Director "Of course Sento, I figured that something like this would happen." Takumi walked up to Ochako, handed her some forms and told her "We can hire you as a part-time tester for the Institute. Just go over your schedule so that this doesn't interfere with your studies and everything should be fine." Ochako excitedly asked "Wait, just like that?!" Misora answered the brunette "Yup! Just like that!" The rest of the girls and most of the boys of class 1-A had asked Sento their questions. They varied from how loaded Sento was, his favorite color, and questions about his and Misora's relationship from the girls (mostly Mina).

The last one to ask Sento a question was Izuku. The green-haired kid confidently asked the genius "How are you determining who gets the Nebula Gas quirk?" Sento was visibly proud of Izuku for asking that important question. Sento told him "You know, prime minister Himuro asked me that very same question after he first saw me use this quirk. Right now, Banjo, Misora and I are the only known Nebula Gas users. I'm trying to keep the number of Kamen Riders to a minimum for now as I don't want to accidently grant the quirk to someone who might become a villain. Or worse, one of the other regions or another country might get some funny ideas and attempt to create their own Nebula Gas empowered soldiers to use for war. I won't abide by that!"

Izuku gave a sigh of relief that his senior was being responsible about who he allowed to receive the quirk.

Banjo's stomach started growling out of nowhere, causing everyone present to look in his direction. The musclehead rubbed the back of his head and asked "If we're done here, can we please go grab some lunch? I'm starving!"

Sento agreed and said "Sure thing Banjo. This concludes the tour of the Institute. Now, let's all head back down to the cafeteria!"

(Music stops playing)

After everyone had eaten their fill and were reasonably satisfied, Sento and the rest of the Build crew were about to lead the rest of the group back to the bus to go home. Out of nowhere, the Institute's alarms started to sound off quite loudly, akin to police sirens. Eraserhead used his pro hero tone of voice and asked Sento "What's going on, Sento?!" As if to answer Aizawa's question, the Institute's speaker system projected Taizo's voice to every building in the Institute "Directors Sento and Takumi! Our security cameras are receiving live footage that a couple of Smash are headed toward the Institute! What should we do?!"

Sento ran up to one of the Institute's comm phones that put him through to Taizo and he directed "Taizo, get yourself and the other scientists to the panic room near the research area! We'll deal with the Smash!" Sento looked over to the group, most of the student looking concerned. Sento requested of Takumi "Takumi, please take Kasumi and the others to the security room. Banjo, Misora, you guys come with me. We'll handle this mess!" Takumi nodded and wished the Build crew luck, as the three young heroes headed out to face the monsters.

Takumi, Kasumi, Soichi and class 1-A had all headed over to the security room per Sento's instructions. The room looked very much like a security room from a mall. There were several TV monitors showed live footage from the many cameras placed around the entire Institute. Takumi walked up to the panel, typed on the keyboard, and the center main monitor now displayed what was happened in front of the Institute. The students were scared out of their minds, fearing these unknown monsters nearing them. Three Smash were making their way towards the main building. The one in the middle was slightly bigger than the other two, it also was covered in sharp needles and was mainly white in color.

The cameras showed that Sento, Banjo and Misora had already transformed into Build, Cross-Z and Rescue before engaging the Smash. Taking point as leader, Sento told his crew "I'll take the spiky one, you two take the normal Smash!" Banjo and Misora told him "Got it!" Cross-Z and Rescue took on the two normal Smash, leaving Sento to fight the Needle Smash. The armored physicist noticed something unique about the Smash "This one is carrying an essence!"

Back over to the security room while the others were all witnessing the fight, the students all began to pressure Eraserhead into letting them help the Kamen Riders. Aizawa activated his Erasure quirk, which made his eyes glow an eerie red color and stared intently at class 1-A. Their teacher stated "The Build crew will be all right, remember that I was their homeroom teacher last year. I know exactly what those three are capable of, not to mention that they've had their provisional hero licenses for months now." The gruff hero then turned his attention back to the monitor.

Tenya asked Takumi "Takumi-kun! What are those creatures out there?" The Acting Director told them all "Those are Smash, they are monsters that come about when a person with the Nebula Gas quirk doesn't have enough tolerance and succumbs to the quirk. This results in aggressively rapid cell division almost like cancer, and the subject becomes a Smash. That larger spiky Smash however, seems to have one of the fullbottle essences inside of it. The Build crew will be able to reclaim the essence using an empty Smash bottle."

Izuku then asked the obvious question "Hold on a minute! Those Smash didn't come from the Institute, so how did someone acquire the means to give people the Nebula Gas quirk?" Takumi closed his hand in a tight grip and said "It must have been when the Pandora Box was at the Ministry of Defense. As part of a deal with our prime minister, Sento agreed to have the Box be kept at the ministry every now and then for study. One of the government employees must have figured how to infuse people with the quirk, but without a Build Driver, the subjects went berserk and became Smash." Todoroki asked the Director "How do you turn Smash back into human beings?" Takumi grinned and answered, "If they're defeated by a Kamen Rider, the battle should exhaust their excess Nebula Gas and they'll turn back to normal."

Kasumi took over the briefing "These aren't the first Smash the Build crew have had to deal with. The first time that they appear was ironically enough, when Sento debuted as Build." Kasumi held out her Build Phone and showed everyone footage of the Smash after they were stopped by the Kamen Riders and turned back into humans. She added "The Build crew's main objective currently is to find out who has been turning these innocent people into Smash and setting them loose across the city." After hearing that thoroughly explained exposition, Bakugo pointed at the main monitor and shouted, "If they're really second-years and have their provisional licenses, then this should be a cake walk for them!" Everybody in the room smiled at Bakugo's roundabout compliment.

(Kamen Rider Build Soundtrack CD1 8 Build Sortie starts playing)

Cross-Z was hammering away at the Smash he was fighting. He swung widely at its face, hoping to push it back. It worked, as the Smash fell on its back. Seizing this opportunity, Banjo turned the Vortex Lever on his Build Driver and exclaimed "No one can stop me now!" The Driver announced:

READY, GO!

DRAGONIC FINISH!

Cross-Z had leapt into the air and executed a rider kick. A dragon composed of a bluish energy formed around him as he crashed into the Smash. Sparks flew out of the Smash's body and it fell down. Black Nebula Gas began to seep out of the victim and the Smash turned back into an unconscious man who was wearing a white shirt and pants.

Over with Rescue, Misora had brought out her Reflex Bow and was rapidly firing energy arrows at the Smash from a distance. She then pressed a button on the Bow, and it activated shield mode. She threw the shield at the monster, it struck the creature's face and bounced back towards Rescue, who swiftly caught it. She put away her weapon and cranked the Vortex Lever on her Build Driver and declared "The innocent will be saved!" The Driver announced:

READY, GO!

VORTEX FINISH!

YEAH!

Misora flew into the sky using her white dove wings that emerged from her back, and dropkicked the Smash, trailing down a white energy chart that trapped and led to the monster. Rescue's foot met with the Smash and she landed behind it. The Smash erupted in a shower of sparks and after expelling a lot of Nebula Gas, turned into a passed-out woman wearing all white clothing just like the Smash Banjo defeated.

Banjo ran up to Misora and told her "Yo Misora, I took care of the Smash! You deal with yours?" Misora shot him the peace sign and replied "Of course, was there any doubt?" Banjo laughed and said "Hey, you never know!" Misora looked at Banjo as intensely as she could while in her DovePlane form and said "Well, I know about the time that Kasumi-chan had you model a dress for her once because she gave you the puppy dog eyes." Cross-Z put his hands over his vizors and yelled out "AH! I can't believe that Kasumi told you that, it was supposed to be secret!" Rescue smartly remarked "Banjo, there's never secrets between girls." Cross-Z sighed and said, "Okay smarty-pants, let's go check on your genius boyfriend." Banjo raised his right hand signaling for a high-five, which Misora gladly met.

Meanwhile over with Build, Sento was running into some issues. This essence-enhanced Smash was proving to be more of an issue than the normal ones. Build had broken out the Drill Crusher and was cutting into the Smash, to little effect. The various needles surrounding the Smash kept the Drill Crusher from making full contact. Sento then yelled "How about this!" He changed the Drill Crusher to gun mode and started to blast at the Needle Smash, hurting it quite a lot. Build remarked "So blasting it is the way to go!" He looked at his weapon and thought "The Drill Crusher in gun mode isn't quite enough to take down this Smash. In that case…"

(Music stops playing)

(Gundam Build Fighters Try OP 2 – Just Fly Away by EDGE of LIFE starts playing)

Sento put away the Drill Crusher and reached for his fullbottle holder that was on the left of his Driver. He took out the Orange Hawk and Silver Gatling fullbottles. Sento proudly stated "I've got the winning formula!" Build removed the Rabbit and Tank fullbottles from the Driver and shook the Hawk and Gatling bottles up and down. He placed the bottles in the Build Driver, which announced:

HAWK!

GATLING!

BEST MATCH!

Sento began cranking the Vortex Lever and two halfbodies, one orange and one silver appear. The Driver asked:

ARE YOU READY?

Sento called out "Build Up!" The halfbodies snapped together over Sento's RabbitTank form, changing his suit. The Driver announced:

THE SKY VANDAL!

HAWKGATLING!

YEAH!

Standing fiercely in front of the Needle Smash was Kamen Rider Build HawkGatling form. Build was now half orange and half silver in color. His right vizor was a gatling gun and his left was a hawk. He also had now gained orange wings hanging off of his back. Sento then held out his hand and the Hawk Gatlinger materialized from his lab workbench. Sento then shouted, "With this, you're finished!" Using his newly acquired wings, Build flew up into the air and pointed the Hawk Gatlinger at the Needle Smash. He then flew around the Smash, spinning the Revol-magazine on the gun 10 times, the Hawk Gatlinger sounding off how many shot were loaded as it was spun:

TEN!

TWENTY!

THIRTY!

FORTY!

FIFTY!

SIXTY!

SEVENTY!

EIGHTY!

NINETY!

ONE HUNDRED!

FULL BULLET!

A white energy sphere graph had formed around the Needle Smash, and 100 shots from the Hawk Gatlinger collided with it. The end of the attack was signaled by the explosion that followed. The Needle Smash was knocked out cold. Sento, who had just landed on the ground, pulled out an empty Smash bottle. It had a black web-like design over the wide, clear bottle. He twisted the cap and pointed it towards the Needle Smash. The white-colored essence flew out of the Smash and into the bottle, leaving behind an unconscious man. Sento put his hands to his sides and said, "Threat averted!" Cross-Z and Rescue made their way over to Build and noticed that he took care of business on his end. The three of them bumped fists to a job well done and they disengaged their transformations.

(Music stops playing)

Misora threw herself into Sento's arms and gave him a deep hug. She then leaned in and kissed her boyfriend's warm lips. Sento gently responded in kind and returned the kiss with as much love as he could muster for his girl. Banjo was off to the side, grinning at the affectionate display his best friends were having in front of him. He commented out loud "I need to hug Kasumi!" Banjo quickly made his way back into the Institute, while Sento and Misora were holding hands, taking their time back. Sento then remembered something important and pulled out his Build Phone. He called Takumi, who answered immediately. Sento requested "Hey Takumi, could you please call the hospital? The 3 injured need medical attention."

Takumi calmly responded "Already did that Sento. Don't worry, I've sent some of our medical staff to see to the victims while we wait for the ambulances." Sento exclaimed "There's the Institute's Director! Super dependable as always!" Takumi simply stated, "Just doing my job, Sento."

After a long and eventful day, the class 1-A students got on the bus headed back to UA. Sento stopped Eraserhead right before the pro hero entered the bus and said "I'm so sorry about the Smash attack, Aizawa-sensei. I'm glad the Institute's security system had noticed them quickly, or else things could have been worse." Aizawa shrugged and told Sento "You had no control over who sent those things. Just promise me that next time you run into some Smash, you bring me along." Sento nodded and said "Deal!"

Izuku waved at Sento from his window seat next to Ochako and Tenya. The One for All successor shouted "Sento-senpai! Thanks a lot for the field trip, it was a lot of fun!" Sento gave Izuku a thumbs up as a response. Eraserhead drove the bus back to UA. The Build crew, Takumi and Soichi were the only ones left. Soichi suddenly yawned and said "Man, I'm tired. I'm going home to Nascita. Misora! Sento! I'll see you both at home, ciao!" Owner walked home towards the café. Banjo and Kasumi had also bid their farewells and promised to talk more during school the next day. Misora told Sento and Takumi that she was going to go raid the Institute's Kitchen for a snack, and then she and Sento would head home to Nascita.

After Misora left, Sento and Takumi were the only two left. Sento seized this opportunity to show Takumi something. He said, "Follow me, Takumi." The two went back to Sento's lab and both geniuses sat in front of Sento's computer. Sento pulled out a USB flash drive from his coat pocket and told Takumi "After today's events, it's become clear that we need to improve the Rider System. Takumi, please keep what I'm about to show you a secret for now. We'll show the others later." Takumi nodded and asked, "What is this secret?" Sento plugged the flash drive into an open port and several files started to pop up on the computer's screen.

The main file was a blueprint of what looked to be an evolved Build Driver. The heading of the file read: PROJECT SCLASH. Takumi's eyes nearly bulged out of their sockets and he hurriedly spoke "Sento, these are plans for a next-generation Build Driver!" Sento smiled widely and replied to his curious friend "Yes Takumi, and you're going to be the one who will help me build this." Takumi paused for a moment, the asked "Sento, who are we going to get to be the first one to test the Sclash Driver?" Sento submitted "Well…"

Misora had gotten her snack and Sento and Takumi had returned from Sento's lab. She noticed that the two were excited and she commented "Aren't you two looking happy!" Sento smiled at his lovely girlfriend and said, "We were just discussing future projects, that's all." She grabbed Sento by the arm and led him out the exit of the building. They both said goodbye to Takumi and headed home. Takumi was still fixated on who Sento recommended to test out the Sclash Driver once it was finished "So, you chose THAT person. You'll hear no objections from me."

Unknown Location

Darkness. Shadows and filth. Blood Stalk did not enjoy having to navigate through an underground sewer in order to meet with his former partner in crime, All for One. He was a tricky bastard to find for starters. Most people don't even know that he exists. Blood Stalk vividly remembered all of the chaos and uprisings that he and All for One used to cause on a near daily basis way back when quirks were just discovered. Their goals were similar and their personalities even more so. The two were about as close as two siblings. Blood Stalk reached the end of the tunnel and found All for One, sitting in a chair with IV fluid bags attached to him and most of his face destroyed.

(CW's The Flash Soundtrack - Eobard Desiccates Wells starts playing)

All for One began the conversation immediately "My old friend Blood Stalk! Or do you prefer,?" Before All for One could finish, Blood Stalk raised his hands in a surrendering manner and said, "Blood Stalk works." Stalk grinned evilly underneath his helmet and said "It's been too long, my friend! Look what they did to you!" Stalk shook his head and continued "I'm sorry that I wasn't there when you and All Might had your titanic fight." All for One waved off Stalk's apology and said "No need for apologies, I don't fault you for my present condition. In fact, one could say that we're now both in similar boats, don't you agree? We're both stuck somewhere that we don't want to be and we're merely shadows of our former selves."

All for One then weaved his fingers together and rested his chin over his hands. He proposed to Blood Stalk "What if we could get it all back? Not just what we lost, but also revenge! Sweet, sweet revenge!" The Symbol of Evil's words were resonating with Blood Stalk. Stalk laughed joyfully and said, "I knew I made the right decision in coming here tonight!" Blood Stalk pulled out his TranSteam Gun and chillingly said "Once more! Let's turn this world upside down once more!" As both villains began laughing, it was at this moment that an alliance of evil was truly cemented.

A/N: There we go! This concludes the field trip chapter. Next chapter, we'll see class 1-A take on combat training with All Might leading them. How will events differ from the canon? Will we see a kinder Bakugo, will Izuku prove his meddle as a hero? Is Sento getting ever so closer to finding his parent's killer?

Man, I got chills as I was writing the meeting between Blood Stalk and All for One. As evidenced by this chapter, I'm going to be ramping things up for both the heroes and the villains.

So, until next time, Plus Ultra! DarkAbyssBreak is back at it!