After Yuto talked to his teammates and learning they did indeed have feelings for him along with Glass who thanks to Zeo showing her and the other Isekai people Team Light's adventures from the beginning saw Yuto and grew to admire him and developed feelings for him.
The girls did rock, paper, scissors to decide who gets the first date and Yakumo won. Yuto knowing Yakumo's taste did some research on Bellwood to plan a good first date for her. Unknown to Yakumo they are going to the Bellwood Museum as they were having a special event. They were displaying some of the world greatest arts such as the Mona Lisa from the Louvre Museum in Paris, France.
Kurumi was staying behind, so she doesn't become a third wheel. Luckily the length they can be away from each other doubled so they have some more freedom.
Yuto decides to change his clothes for his date with Yakumo. He is now wearing EMIYA's causal clothes with the shirt being short sleeved and sky-blue instead of being long sleeved and black. He also had a bland fedora with a sky-blue band on his head. Daito was in his compact mode and in one of Yuto's pockets. As he was waiting, he hears, "Yuto!"
He turns around and sees Yakumo. He blushes at the clothes she chosen for their date. She was wearing a white and blue sundress that tastefully exposes her cleavage a bit.
"Hey Yakumo. Ready for our date?" Yuto asks her said smiling.
"Yep." She said with a blush as she admires Yuto's new clothes thinking they make him look very handsome.
Luckily Yuto was able to borrow a car and some money from Brad in exchange for some steel and Yuto used some Seals he knows and using Daito's database that surprisingly had info on Seals Yuto didn't to help increase the security of the lab. Thanks to Daito giving him training due to a VR program he had on driving and piloting different vehicles Yuto did know how to use a car. Why he had that even though Yuto's world was underdeveloped in some aspects of technology was because of a just in case scenario.
"So, Yuto where are we going?" Yakumo asks as they went to Brad's car.
"It's a surprise." Yuto said with a smirk confident that he made the right decisions on his plans for the date.
"I hope it's a good one my king." Yakumo said flirty with Yuto a bit as Yuto opens the car door for her. He then closes it when she got inside the car, and he went over to the driver side.
After a half hour of driving they arrived at the Bellwood Museum.
"So why are we at the museum?" Yakumo asks as they got out of the car.
"They're having a special event where they showing some of the greatest works of art from around the world and considering how much you love art I figured this would be the good first stop of our date." Yuto said smiling.
"That sounds wonderful." Yakumo said getting excited. They paid for their tickets and enter the museum. They then start looking at the exhibits showing wonder at them. As they were looking at the exhibits Yuto notices Yakumo had a thoughtful look.
"What are you thinking about Yakumo?" Yuto asks her.
"We don't have anything like this back home. I don't think any of the other villages have something like this." Yakumo said.
"You might be right about that. Maybe that's something we should do when we build Tekkadan." Yuto said thinking about the future.
"Really?" Yakumo asks surprise at Yuto's suggestion.
"Well why not? It's our kingdom so why shouldn't build one?" Yuto asks her.
"You're right." Yakumo said after thinking for a moment.
"It will be a good place for the future children living in the kingdom to learn from. Including our future little ones." Yakumo said blushing at the last part thinking about her future children with Yuto. Yuto also blushes before he gain a thoughtful look.
"How many children do you want?" Yuto asks her causing Yakumo's blush to darken a bit as she gains a thoughtful look.
"I don't know. Maybe four?" Yakumo questions.
"If you want four children then I will give you four in the future and if you want more than four I will give as many children as you want." Yuto said to her holding her hand.
"Yuto." Yakumo said touched as she kisses Yuto. Yuto kisses her back but then an explosion happens causing them to separate.
"What's going on?!" Yakumo questions.
"I don't know but whatever it is it can't be good." Yuto said narrowing his eyes as he took Daito from his pocket and activates him.
"What's going on partner?" Daito asks seeing Yuto and Yakumo were still in the museum.
"There was an explosion. I need you to hack into the cams to see what is going on."
"Got it. I'm hacking in now." Daito said hacking the cams only to become surprised at what he was seeing.
"Um partner you might want to take a look at this." Daito said creating a holographic screen showing Yuto and Yakumo what was attacking the museum (The Mummy from the original series only it looks like UA Snare-Oh with its colors).
"Is that a mummy?" Yakumo said scared as she was scared of mummies since they had a movie night one night and one was a horror movie involving mummies.
"Actually, it's an alien species call Thep Khufans. The Thep Kkufans are mummy-like creatures composed entirely of organic bandages made from an alien material that feels like old cloth but have elasticity." Daito informs them as he pulls up the Thep Khufans' strength, abilities, and weaknesses.
"How do you have this information Daito?" Yakumo asks as she and Yuto quickly study the information.
"I hacked into the Plumbers' database thanks to Ben telling me where to look." Daito said.
"Is that safe?" Yuto asks since Daito to his knowledge never hacked anything before today and he knew the security the Plumbers have on their systems must be good.
"Don't worry I was extremely careful, and I made sure to cover my tracks pretty well by using several decoy accounts." Daito said waving off Yuto's concerns as Yuto and Yakumo quickly runs to where The Mummy is. They stop concealed behind some cover as they observe The Mummy.
"What is that its grabbing?" Yakumo asks as The Mummy grabs a purple glowing crystal that was in some kind of clear container.
"Scanning. It's Corrodium." Daito said surprised.
"Corrodium?" Yakumo and Yuto questions out loud.
"Corrodium is a mineral of great potential energy, similar to coal or uranium of Earth at a larger scale, and for a time was mined throughout the galaxy as an efficient, large power supply. However, like uranium on Earth, Corrodium has severe side effects and is very unstable, so its use was largely ceased, except for inhabitants of the Anur System. Also Thep Khufans are the only beings who can handle Corrodium without special protection." Daito said informing Yuto and Yakumo.
"What kind of side effects?" Yuto asks concerned.
"Corrodium can be used to generate ample supplies of energy but will mutate many organisms. Humans and other Earth-native species are particularly susceptible to mutation from the crystal, with their bodies being warped beyond recognition and their minds being corrupted to hostility at anything that moves. The mutagenic effects are temporary, though prolonged exposure to Corrodium would make the mutations permanent. The exposure to Corrodium can be negated with proper protection like level 12 Hazmat suits." Daito said giving them the rest of the information on Corrodium.
"And we don't have that." Yakumo said as The Mummy destroys the glass case and puts the Corrodium inside its chest.
"Actually, if Yuto and I transform he is protected since the suit blocks out radiation. For Yakumo I do have some durable Hazmat suits she can use but she will have to be careful as there is a limit on their durability and if it gets even a small cut she will mutate." Daito said pulling out a Hazmat Suit for Yakumo (it is the same as what Gwen and Max wore in the original series but sky blue and black with the Tekkadan symbol in sky blue on a black shield on the chest where the heart is). Yakumo quickly puts it on.
"Zero-One Henshin Tron~" Yuto sings.
Yuto was surrounded by numerous sky-blue colored orbs. A big orb and a small orb went zooming to his head. The big orb collided with the back of his head while the small orb collided with his face that wasn't covered by his visor. The big orb became helmet of Megaman X, and the small orb became a Gundam-faceplate that covered the rest of his face. 5 more orbs 1 bigger than the orb that became the helmet and 4 small orbs a bit bigger than the one that the one that became the faceplate. The big one collided with his torso while the 4 small ones collided with his limbs forming the Kamen Rider ZeroZero-One's form minus the Forceriser with the yellow changed to sky blue. Another 3 orbs one orb the same size as the first orb and 2 small orbs collided with his chest and feet respectively. The chest and shoulder plates of Kamen Rider Zero-One's Shining Assault Hopper form on it and the 2 small orbs became the Rocket-Skates of Shadow the Hedgehog with the red replaced with sky blue. Then one big red orb the size of a person came in front of Yuto and became Yuto's Red Dragon Fusion Sword that then stabs into the ground. Yuto places his hand on the handle and lifts it up and starts swinging it like a master swordsman.
Zero-One had a new addition on his suit being the Tekkadan symbol in sky blue on a black shield on the chest where the heart is.
"Ready Yakumo?" Zero-One asks her.
"Ready." Yakumo said firmly as music begins playing as Zero-One starts to sing.
(Play A Little Faster by There for Tomorrow)
You keep calling it a crash and burn
Zero-one swings at The Mummy who dodges it.
Just wait your turn
"Water Style: Sea Serpent Water Festival Justsu!" Yakumo send out multiple Sea Serpents made out of water at The Mummy.
You might have time to speak
The Mummy using its Elasticity/Stretchable Limbs and grabs large pieces of rubble.
There barely was a lesson learned
It dodges some of the Sea Serpent Water constructs and uses the pieces of rubble as makeshift clubs and starts destroying them with water starting to soak its limbs.
'Cause it'll return no favors back to me
Zero-One spin kicks The Mummy's head from behind with a Chakra enhanced kick that knocks it away.
I'm sure it tasted oh so sweet
'Did you just spin kick him?' Daito asks his partner.
But it was never good enough for me
I bit the tongue behind my teeth
It was never good enough for me
'I know, right? I've always wanted to do that.' Zero-one Mummy quickly recovers and fires to shoot multiple beams of Corrodium enhanced mana from its hands at Zero-One.
You said you always keep your word
Show me what you're after
"Oh come forth The Seven Rings that Cover the Burning Heavens: Rho Aias!" Zero-One brings forth the shield used by Aias the Great that Zelretch showed him before they picked up the girls to block the mana attacks while channeling as much Chakra as he can to strengthen them.
I thought you promised me the world
Tell me what you're after
"We need to get that Corrodium out of it." Yakumo said causing Zero-One to nod in agreement.
Go on and take you way too far
"I got an idea." Zero-One said as he quickly summons a few Shadow Clones.
'Cause here we are, waiting once again
The Shadow Clones attack The Mummy by using the Chakra Chains.
You said you always keep your word
"Yakumo quick use the Hidden Mist Jutsu!" Zero-One said as The Mummy does it best to dodge the chains.
Show me what you're after
"Hidden Mist Jutsu!" Yakumo creates a small area of heavy mist.
Just a little faster
The Mummy was getting soaked by the mist causing it to start slowing down.
Are mine the only eyes that see, so steadily
This cut and dry routine
Even when you're by my side
I still need time to feel the company
Suddenly it was caught by the Shadow Clones' Chakra Chains.
I'm sure it tasted oh so sweet
But it was never good enough for me
I bit the tongue behind my teeth
It was never good enough for me
Zero-One then appears in front of it.
You said you always keep your word
Show me what you're after
I thought you promised me the world
Tell me what you're after
He enhances his hands with Chakra and starts to pull away The Mummy's organic chest bandages.
I want to take you way too far
'Cause here we are, waiting once again
You said you always keep your word
Show me what you're after
Just a little faster
Just a little faster
The Mummy tries to break free forcing the Shadow Clones to use more strength to hold it in place.
Hold your breath now
The backbone's wearing thin
From the pain that settles in
When we learn too much too soon
Hold your breath now
The backbone's wearing thin
From the pain that settles in
When we learn too much too soon
Zero-One uses his Chakra Chains to help hold it in place as he tries to get the Corrodium.
Too soon
The Shadow Clones quickly reinforce their chains by creating Striking Steel Snakes to coat the Chains.
You said you always keep your word
Show me what you're after
I thought you promised me the world
Zero-One manages to get the Corrodium out of The Mummy as he jumps away from it.
Tell me what you're after
I want to take you way too far
'Cause here we are, waiting once again
You said you always keep your word
'Time to end this.' Zero-One thought as he quickly does hand signs for a new Jutsu he created.
Show me what you're after
"Steel Style: Iron Coffin Prison!" Zero-One slams his hands on the ground and a bigger than average closed iron coffin with spiked chains arises from the ground behind The Mummy.
It was never good enough for me (It was never good enough for me)
The coffin opens up and the chains grabs The Mummy and slams it into the opened coffin.
Show me what you're after
The coffin closes on The Mummy as chains wrapped around the coffin before several padlocks locks the chains together capturing The mummy.
Just a little faster
Zero-one sighs as he says, "Capture complete."
Zero-one then stores the Corrodium inside a multi-layer steel container to the point where it's radiation will not affect anyone. He then stores the container and the coffin into Daito's hammer space before ending his transformation.
"Well since that's over do you want to continue this date somewhere else or go back?" Yuto asks leaving the choice to Yakumo.
"Let's continue somewhere else. No sense in letting what just happened mess up the rest of our day." Yakumo said.
"Great. Then let's get out of here." Yuto said. Yakumo agrees and they left the museum with Daito making sure the cameras did not record anything they weren't supposed to.
Later after getting back from their date Yakumo was dragged away somewhere else by the girls to hear all the details on their date and Yuto before going inside sees a woman with black hair wearing a white shirt, she is pale, but the most shocking part is that she has four arms with her grabbing onto Kazuo's checks with her big hands.
"Kazuo!" Yuto calls out in worry as he came inside as his Negative Emotion sensing told him that the girl was bad news.
Yuto looks at Kazuo and asks, "Who was she?"
"I don't know." Kazuo said.
"Looks like we'll have to keep an eye out." Yuto said narrowing his eyes.