On the day of Issei's first date, the genius surgeon, Hiiro Kagami, had come to Kuoh from Seito. The reason was…

"Father, you don't have to do this… if you're looking out for my best interests, schedule an operation instead of a vacation…"

Basically, it was a vacation. Hiiro's father, Haima, told him to take a vacation since he had been working hard lately with surgeries and killing Bugsters. Of course Hiiro wanted to operate that day if he had time to take a vacation, but his father told him that if he worked any longer he would get sick, so he had no choice but to take his leave.

After thinking about what to do, he decided to go to a sweets store in Kuoh where Misaki Tsuchiya, a patient who had undergone surgery for pancreatic cancer, had given him an all-you-can-eat ticket for sweets as a gratitude.

"Here."

A girl in some kind of cosplay handed him a flyer.

"Your wish will come true… you say? Hmph, a wish is only worthwhile if someone realize it themselves…"

He then crumpled up the flyer, threw it in the trash, and headed for his destination once again.

Sweets store

"Here's your tea and chocolate cake."

"Scalpel."

"Huh?"

"Ah… I mean, knife." Hiiro inadvertently said that to the waiter out of habit, and hurriedly rephrased it.

And like usual, Hiiro was eating the cake using a knife and fork, but his face looked a bit thoughtful. The reason was about the black Kamen Rider that Kiriya and Nico had encountered a week ago.

"According to the Examiner, he's a Kamen Rider fighting for the Bugsters… where did he get the Driver and the Rider Gashat…? Or maybe he's a reincarnator too?" Hiiro muttered.

"You've got a lot on your mind, Prodigy."

"! Examiner!? Why are you here!? I mean, aren't you supposed to be at work today!?"

"Aah, this is part of my job."

"What do you mean…"

Just as Hiiro was about to ask, a waiter came to the table to ask Kiriya what he wanted to order.

"Welcome, what can I get for you?"

"Err… I'd like a large Neapolitan, five slices of pizza, a pile of potatoes, a large omelet, a large salad, a coke and a cake."

"Understand."

"That's too much." Hiiro said to Kiriya, who ordered for too many foods at once.

A few minutes later

"Ooh~ yummy~"

Kiriya filled his mouth with the ordered food.

"Oi, can't you eat a bit more slowly?"

"Hmmf… mmf… nom, nom, nom..."

"Swallow before you speak."

When Hiiro told him that, he swallowed and drank some water.

"Ah, sorry, Prodigy, but I haven't eaten anything since yesterday."

"What do you mean you haven't eaten anything?"

"Actually, there have been a number of murders here in Kuoh recently, and I haven't eaten anything because I've been busy with the autopsies and investigations."

"Murder… and what did you find out?"

"Yeah, all the bodies of the victims were found to have been killed by the enchanted silver bullets and blades of light that are the main weapons of the exorcists, and recently there have been reports that not only stray devils but also fallen angels have been active in Kuoh, so I thought it was quite fishy… so I'm here to see if I can get something."

"I see, that's a big deal…"

"Man, Bugsters, fallen angels, devils… what is the world coming to?" Kiriya muttered.

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"What's wrong!? Murayama!? Hey!"

When Hiiro and Kiriya looked in their direction, they saw a Kuoh Academy female student lying on the ground.

"What's wrong!?"

"Murayama! She suddenly fainted!"

"Calm down, I'm a doctor, let me have a look!"

"Y-yes."

Hiiro checked the pulse and heart and lungs of the collapsed girl.

"Her pulse, heart, and lungs are normal… so what…" Hiiro muttered.

A noise ran through the girl's body.

"No way! Examiner, get the Game Scope and my bag!"

"Righto."

Borrowing a Game Scope from Kiriya, Hiiro examined the girl with it.

"This is a game disease… has it started to infect Kuoh? Damn, let's think about it later, focus on treatment first."

Hiiro took out the Gamer Driver and Gashat from the bag.

"Um, what is going on here?" The girl who seemed to be the student's friend demanded.

Kiriya chuckled a little.

"Don't worry, the Prodigy here will take care of it, so stay out."

"But…" The girl muttered with a worried look on his face.

"Don't worry, I will definitely save this girl."

With that, she didn't know why, but Hiiro's words were reassuring.

"Alright, please take care of Murayama." She said as she backed away.

"Okay, let's go, Examiner."

TADDLE QUEST!

"Huh, right behind you, Prodigy."

BAKUSOU BIKE!

"Skill Level 1, henshin."

"Henshin."

Gashat! Let's game! Metcha game! Mutcha game! What's your name!? I'm a Kamen Rider!

As soon as Lazer and Brave transformed into Level 1, the schoolgirl's body transformed, turning into sword-like Bugster Union.

"Commencing Bugster removal operation."

"Now, we're revving it up!"

And with that, the two of them charged. Of course, the Bugster Union attacked the two, but they skillfully avoided the attack and struck back with their own. And when they had attacked to some extent, Brave swung his Gashacon Sword with all his might and hits, separating the Bugster and the schoolgirl.

"I am Kaiden! Of the third standing!"

The one who separated from the schoolgirl was Kaiden, the Bugster from Giri Giri Chambara.

"Skill Level 3."

"Third Gear."

Gashat! Gachan! Level Up! Taddle Quest~! A Gacha! OK! DoReMiFa Bea~t~!

Gachan! Level Up! Bakusou Bike! Giri-Giri-Giri-Giri! Chambara!

The two transformed into Level 3 and each took up their weapons and prepared for battle.

"It's too small here! Let's do it in the nearby park!" Kaiden said, and left the scene.

"H-hey, wait!"

"To the park. Let's go, Examiner."

"Alright, Prodigy."

Brave mounted Lazer's motorcycle form and headed for the park.

Kaiden was in a corner of the spacious park.

"I've been waiting for you! Let's begin the duel!"

"You bet I am!"

"You're a strange one, choosing where to fight!"

With that, Lazer and Brave picked up their weapons and began to attack, while Kaiden deftly avoided their attacks.

"Shit! This is too much!"

"He's a Bugster from Giri Giri Chambara, so he's better at avoiding attacks than attacking."

The two of them gripped their weapons as they tried to think of a way to exploit an opening.

Then…

"""EEE!"""

A mysterious group of 10 black spandex-wearing men, Shocker Combatmen, appeared around them and started attacking.

"Huh!? Who are these people!?"

"Oi, oi, what the hell!? Kaiden! They are… not your friends."

"W-what are you…?"

Kaiden was also attacked by these men, who fought back with his two swords.

These are the Combatmen that Toma ordered to pursue the fallen angels earlier, but they lost sight of the enemy on the way and was wandering around the area when they spotted Hiiro, Kiriya, and Kaiden, so they started attacking them. Actually, this can only be described as an unfortunate accident. Toma had been targeted by many reincarnators because he was close to the main character, so he had ordered his Combatmen to attack the reincarnators whenever they saw them. Although Hiiro was reincarnated by a different deity, the Combatmen still attacked Brave, whom Hiiro was transforming into, and Kaiden and Lazer, who were nearby.

Meanwhile, Kaiden was being hounded by so many Combatmen that he was not paying attention to the two of them, a sight that Hiiro did not miss.

"Now! Examiner!"

"Not a very good way to do it, but it's the only one way."

The two of them inserted their Gashats to their weapons.

Gashat! Kimewaza! DOREMIFA CRITICAL FINISH!

Gashat! Kimewaza! GIRI GIRI CRITICAL FINISH!

"HAAAAAAAAAAH!"

"ORYAAAA!"

"Oh, no!"

"""EEEEEEEE!"""

Their attack blew them away with their finishers.

"GAAAAAHH!"

"W-what the hell!?"

Then they heard yells in the direction of where the Shocker Combatmen had been blown up, and they headed towards the place to see what was going on.

And there it is.

"This is…"

There was Rias, the devil who ruled this place, her peerage, two unidentified Kamen Riders, a snake monster, and a student lying in a pool of blood in the middle of it.

"You're the ones causing all this commotion?"

"Oi, oi, devils! This is a bit much."

The two said to those present.

Garagaranda was bewildered by the scene before him. His Shocker Combatmen he spawned had been blown away, and what appeared to be Kamen Riders Brave and Lazer.

"Kamen Rider Lazer… and…" Garagaranda said.

"Kamen Rider Brave!? Don't tell me, reincarnators!?" Ex-Aid half-yelled, half-whispered, continuing his sentence.

And then…

"You are… could it be, a reincarnator…?"

"Heh! I am Kamen Rider Ex-Aid, the OC Lord of this world!"

"Hey! The only OC Lord is me! Kamen Rider OOO!"

Rias facepalmed at their declaration.

"Two reincarnators… don't tell me that the monster next to them is also… so that means that the black tights army from earlier are his underling!?"

"…What would you do if that's the case?"

"You'll pay dearly for interfering with my operation." Brave spoke to them, pointing his sword at Garagaranda.

"Do you have a minute?" Rias called out to Brave.

"What is it, devil? Don't interrupt my work."

"You bastard! How dare you talk like that to Rias-buchou!"

"Silence, Ryoichi, you mysterious knight, what is this all about?"

"Whatever do you mean?"

"Yes, I've been entrusted with this territory by the Demon Lord, and you trespass on this town without my permission—"

"Hmph, entrusted, you say? And it's not very secure, either…"

As he spoke, Brave's eyes caught sight of Issei lying in a pool of blood. "Hey, you, what's that young man lying there?"

"Oi, bastard! Answer buchou's question—"

"Eito, shut up, he's my new pawn, the fallen angel just now—"

When Rias said that much…

"HAAH!"

Brave slashed at Rias.

"Buchou! Why you! What the hell are you doing!?"

Fortunately, Rias was not harmed as Ex-Aid shielded her from the attack.

"You… you dare to carry out bioterrorism openly, and in front of my eyes, no less!?"

"I agree with you."

Brave and Lazer pointed their weapons at the enemy as they spoke.

"It looks like we're going to have to fight, okay, and if you're up to it, do it in the name of the Duke of Gremory, you two, okay?"

""Yes, buchou!""

And with that, OOO and Ex-Aid brandished their weapons.

"We'll deal with you later, Shocker bastard."

"Brave and Lazer are not big deal! They're just secondary riders! You're no match for the Lord."

OOO and Ex-Aid declared to the two.

"Jeez, I guess we're in for it…"

"I've heard that most of reincarnators are not good people… so it's true, Examiner, you take the pink rider, I'll take the other one."

"Righto!"

Both Lazer and Brave looked at Rias and the others as they spoke.

"Well then, time for revving it up!"

"Commencing emergency surgery of removal of devils and malignant reincarnators."

With that, Lazer charged towards Ex-Aid and Brave went for OOO.

As they fought, they both thought of one thing.

"What the heck is this guy…"

"He's weaker than I expected…"

Lazer and Brave muttered to themselves. Yes, both Ex-Aid and OOO were surprisingly weak.

"Fuck! What the hell!?"

"I'm supposed to be the Lord! I should be the strongest!"

With that, Ex-Aid and OOO attacked Brave and Lazer. However, all of their attacks were either dodged or bounced back, and they retaliated twice as fierce.

"Oi, oi, that's it? Maybe he is Ex-Aid, but he is no match for me."

"Even Charlie Bugster is better than this, and he only wanted to ride bicycles."

The two of them said in disgust at the enemy's overly lackluster skills.

'Aside from their personality, not only Eito, who is quite skilled among my peerage, they also pushed Ryoichi that far… who are these people!?'

Rias, on the other hand, could not leave this place to cover Issei, whom she had just reincarnated as one of her peerage, so she watched the fight from afar.

Then…

"Shit! Then I'll use this!"

Sai! Gorilla! Batta!

OOO's medal change gave him a head with massive horn and large arms. And when Brave saw this, he instantly predicted the enemy's capabilities.

"The enemy's form is defense-oriented, then…"

GEKITOTSU ROBOTS!

Brave took out the Gekitotsu Robots Gashat, activated it, inserted it, and pulled the lever.

Gashat! Gachan! Level Up! Taddle Meguru! Taddle Meguru! Taddle Quest~! A Gacha! Buttobase! Totsugeki! Gekitotsu punch! Gekitotsu Robots!

"I have experience with surgical assist robots."

With that, Brave lunged towards OOO.

"Ha! Don't get too cocky even if you changed form!" OOO slammed Brave with a punch, but Brave avoided the attack.

"Too slow!"

"GAAAAGH!"

He attacked with his robot arm and blew OOO away.

Meanwhile, Ex-Aid shouted, "That's! That's my Gashat! Dammit! Damn secondary character!"

"Where are you looking at!?"

"AAAAAAAAAAHH!"

Lazer struck Ex-Aid, who was looking away, from a point blank range with an energy bullet from his Gashacon Sparrow.

"Oi, oi, come on, you're too weak."

"Shut up! I'm the OC Lord—"

"OC Lord, Ocelot, I don't care, but you need to work out a little more."

Lazer picked the Gashat and inserted it into his weapon, while Brave also took out the Gekitotsu Robots Gashat and was about to strike OOO with a finisher.

Meanwhile, Garagaranda is left alone.

"This is my chance… I should retrieve Issei while I can…"

Then…

"! Watch out!"

"Eh? Kyaa!"

Garagaranda pushed Rias down on top of Issei and covered them both. Then energy bullet rained down on himself, OOO, Ex-Aid, Lazer and Brave, and Brave let go of the Gekitotsu Robots Gashat that he had been trying to put in the Kimewaza Slot at the sudden attack.

"AAAGH!"

"Shit! Where the hell is that come from!?"

OOO and Ex-Aid looked around.

"Oi, oi, this energy bullet…"

"Yeah, he's here…"

They said, and looked at the direction the energy bullets were coming from. There stood Kamen Rider Genm, who had attacked Lazer a week ago.

"Kamen Rider Genm!?"

"Now it's Genm, huh?"

"He's intruding my territory again!"

Ex-Aid, Garagaranda and Rias all exclaimed when they saw Genm's appearance.

"We've got a nasty one here. Change in tactics, we'll take him out first!"

DRAGO KNIGHT HUNTER! Z!

"Skill Level 5."

Gachan! Level Up! Taddle Quest~! A Gacha! Do-Do-Drago! Na-Na-Na-Kni~ght! Dra-! Dra-! Drago Knight Hunter! Z!

Brave immediately changed form to Level 5 and attacked Genm.

"Ah! Wait, Prodigy! He's!"

"UOOAAAHH!"

Brave slashed at Genm with his Drago Knight Blade. But Genm caught the attack and fired a single energy bullet at close range, blasting him away.

"Dammit!"

"Are you okay, Prodigy?"

"Yes, what… what is going on here!?"

To his surprise, Brave's Life Gauge was half empty after just one energy shot.

"He's Kamen Rider Genm Level 0, and he has the ability to suppress the Bugster Virus."

"Suppressing the virus!?"

"Yeah, now that he's touched you, your level is lower than normal. If you calculate the time he touched you and the level of the Gashat you're using… I'd say your current level is 1."

"What did you say!?"

Brave was so shocked by the unexpected. And then…

"Watch out!"

Genm fired several bullets at Brave, while Lazer protected him from the attack. Then Genm picked up the Gekitotsu Robots Gashat that Brave had dropped and threw it at Ex-Aid.

"Take it."

"? Whoa! I don't know what's going on, but I got the Gashat! I'll take the Drago Knight Hunter as well."

Ex-Aid approached Brave as if he had won and proud of the at the situation he had been struck by.

"Brave, time to die."

GYU-IN!

Genm also put his Bugvisor into Chainsaw Mode and approached Brave.

"What do you think of tactical retreat, Prodigy…"

"Don't be ridiculous, the surgeon can't just walk away from the surgery!"

"But at your current level…"

"While I'm only Level 1 right now, but still! But still, if there's even the slightest chance of winning, I'll fight! I won't give in to the enemy in front of me!" Brave shouted as he stood up.

Then…

"Heh, fine… got no choice then, I'll ride this race to the end!" Lazer said as he readied his Gashacon Sparrow.

"What a waste of time."

"What a pain in the ass! But fine! Lazer! A secondary rider like you will be punished for defying me, the OC Lord! I'm taking your Gashat too!"

"Hey, wait! That one's mine!"

Genm, Ex-Aid, and OOO were about to attack them when it happened.

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Melon Energy Squash!

"WHAT!? GUAAAAAAAAAAAGH!"

As soon as an electronic sound was heard, a slash from a green energy struck Ex-Aid, reducing his Rider Gauge to half.

"W-what!? What happened!?"

"What is it now!?"

"Who is it!?"

OOO, Garagaranda, and Rias all confused and didn't know what was going on.

Lock On! Lemon Energy!

"AAAAAAAAAAAAHHH!"

This time, a yellow energy arrow hit OOO, blowing him away and canceling his transformation.

"They've come…" Genm, on the other hand, muttered to himself as he watched the attack.

What's going on…?"

"Who is it…?"

Brave and Lazer were both confused as well.

"Are you okay, CR's Doctor Riders?"

"Are you alive?"

In front of their eyes, two Kamen Riders appeared, one in a white suit with green melon like armor, the other in a blue suit with lemon-like armor, both wielding red bows.

"Who are you two…?" Hiiro asked in confusion.

The other three were bewildered by the new mysterious Riders, but also suspicious of the scene in front of them. The first to speak up was Ex-Aid.

"What the hell is going on!? Why… why are you here…"

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"Kamen Rider Zangetsu Shin and Kamen Rider Duke are here!" Ex-Aid shouted to the newcomers.

"Get ready for this, brats."

"Unfortunately, we're not as gentle as these doctors."

Zangetsu Shin and Duke declared as they aimed their Sonic Arrows at the three of them.