Honnouji Academy - Arena
Ryuko transformed and lunged at Nui with all the strength that she had. Blinded by her rage, Ryuko kept swinging at her enemy without any form of strategy. Nui easily blocked them all with her umbrella and sword.
Ryuko: My dad told me that if I took this scissor, I'd be sure to find the person who killed him! What do you know, he was right! You were the one in my house, weren't you!?
Nui: Yup, I sure was!
Ryuko: So the woman I saw back then was you!?
Nui: You got it! If I'd known a girl as cute as you was on her way, I would've stayed right there and waited for you.
Ryuko: You BITCH!
Nui: Do you think you can avenge your dad with, that? Not happening, girl!
Ryuko: We'll see about that!
Senketsu began to burst out steam, and the red lines on him were bubbling red hot.
(Y/N): Watching closely Her engine is redlining. She's gonna blow a gasket if she doesn't cool down.
Mako: Ryuko!
Senketsu: Stop it Ryuko. Your blood grows dangerously hot! If this keeps up, I won't be able to control myself!
Senketsu exploded into a giant maw and then chomped down on Ryuko, instantly transforming her into a monster. The blood-red beast roared, shaking the arena.
Satsuki: I'm going down there.
Because of Nui's taunting, Ryuko began to destroy the entire arena, thrashing wildly.
(Y/N): That doesn't look good.
Inumuta: Matoi is in grave peril. In just a few minutes, she'll die from blood loss!
Mako: She needs a blood transfusion! As the daughter of a Back-Alley Doctor it is my duty to help my friend!
Mako ran from the stands toward Ryuko.
(Y/N): Sparks crackle in his palms I'd better go too. This is getting volatile. -_-
Gamagoori: It is stupid enough that Mankanshoku ran off! What can you possibly do!?
(Y/N): Uh... I can provide covering fire.
Inumuta: Matoi has lost complete control of her Kamui. She is nothing but raw strength and rage at this point, only Lady Satsuki can-
(Y/N): Don't care. Leaving now.
Y/N placed his hands behind him. BOOM! A controlled explosion erupted from his palms, propelling him forward faster than the eye could track. He left a trail of smoke as he dashed toward Ryuko.
Gamagoori: What the-!?
Inumuta: Did he just... propel himself with an explosion!? This is a great time to collect data!!!
Nui: laughs Excellent! It keeps getting more and more monstrous! That's what Life Fiber's gotta be like! Hahaha- huh?
With a sharp BANG, Y/N suddenly appeared between them, sliding to a halt as smoke curled from his hands. He was facing the wrong way.
(Y/N): Hi.
Nui: Huh?
(Y/N): What? Uses a small pop from his left hand to spin himself around to face the right way Landed the wrong way, my bad.
Nui: Who are you?
(Y/N): Uh... Ryuko's friend. The demolition crew.
Nui: Really? giggles That's great! Killing you will make her even more beautiful!
(Y/N): looks at Ryuko The hell is wrong with you? You look like a Nomu.
As Y/N turned back around Nui jumped to him and aligned her Scissor Blade with Y/N's neck.
Nui: Die!
Before Nui could stab him, Y/N grabbed onto Nui's face. His palm glowed bright orange.
Nui: Huh?
(Y/N): Bye.
KABOOM!
Y/N unleashed a massive, concentrated explosion right in Nui's face. The force of the blast didn't just knock her back; it launched her like a rocket. She flew clear out of the arena, clear out of Honno City, and twinkled like a star in the distance.
Nui: EEEEEEEEEEEEeeeeeeeeeeeeeeeeeeeeh!?!?!....
(Y/N): Oh crap, I put too much nitroglycerin into that one. Uh... Nope, nope she's gone. WAAAAY gone... I hope I didn't kill her. Actually, I don't care. Now onto-
Ryuko's massive fist collided with Y/N's head.
THUD
Y/N didn't budge. His neck muscles tensed, absorbing the impact that would have decapitated a normal person.
(Y/N): Uh... hi Ryuko.
Ryuko: GRAaaAAH!!!!
(Y/N): Ah crap. -_-
Ryuko began to swing wildly at Y/N.
(Y/N): dodging with micro-explosions Woah. Watch the paint job!
Ryuko finally connected, slamming Y/N. The arena shook.
Satsuki: I-Impossible!
(Y/N): Ryuko, please stop. I really don't enjoy being punched in the face by you...
Ryuko continued to try and smash Y/N. He crossed his arms, bracing himself. Each time she hit him, a dull thud echoed, his body durable enough to withstand the recoil of his own massive explosions, making him a walking tank.
Eventually, the sheer friction and force of her attacks tore his shirt clean off.
(Y/N): Oh, come on! I just got that cleaned!
Y/N's torso was on full display.
While there were various burn marks and cuts from his quirk training, there was one scar that dominated his chest. A massive, jagged, star-shaped scar that covered his heart and left lung area. It looked like he had been impaled by raw energy. The mark of All For One.
(Y/N): Covers his chest Great. Now I'm exposed. I'm self-conscious about the hole in my chest! Q_Q
Ryuko: RAAaaAAH!!!!
Ryuko kept getting more and more frustrated that her attacks didn't hurt Y/N in the slightest.
(Y/N): Ok, time for a Stun Grenade- wait, no, Mako's here.
Mako: Ryuko!!!!!!!
Mako came rushing in and jumped at Ryuko and hugged her with all her strength.
(Y/N): Mako! Careful, she's hot to the touch!
Mako: Stop it, Ryuko! This isn't like you at all!
(Y/N): To be fair... it kinda is.
Mako: Did you forget what you said to us!? You said it wasn't about avenging your dad, but getting to know him better! But you're just a monster right now! You're kicking, screaming, and destroying our school! I will bring you back!
Mako began to slap Ryuko repeatedly.
(Y/N): Wow. Her slap speed... it rivals my Machine Gun Turret fire.
Ryuko slowly transformed back to her regular self.
Ryuko: Mako...
Mako: AAAAAAH!!!
Mako continued to slap Ryuko, unaware that she changed back.
Ryuko: I'm... smack back... smack to... smack normal... smack
(Y/N): I don't think it's working! Quickly Mako! Use this bat!!!!
Mako: takes bat COME BACK RYUKO!!!!!
Ryuko: You... OW!! can... OW!! stop... OW!!
(Y/N): I found this mace!!!!
Mako: uses mace RYUKOOOOOO!!!
Ryuko: Stop! smack Giving! smack Her! smack Weapons! smack You! smack Ass!
(Y/N): Use this Grenade Launch-
SMASH
Ryuko, face bruised and swollen from Mako's slaps, smashed Y/N in the head.
(Y/N): Ow.
Ryuko: Damn it! I said I'm back to normal!
Mako: Ryuko!
Ryuko: sigh Thank you. Sorry I dragged you along with my rampage, Senketsu.
Senketsu: Don't be. I'm just glad you're alright.
Mako: You nearly died of blood loss, you know?
(Y/N): Phew, glad that's settled with. My hands are itching.
Ryuko: You idiot! Why did you give Mako- Eh? Why is your body covered in scars?
(Y/N): Uh.
Ryuko: What hap...enned... to... Stares at the massive hole-like scar on his chest
Mako: Huh? Ryuko?
Ryuko couldn't finish her sentence as she fell unconscious from blood loss.
(Y/N): Phew! That's convenient.
Satsuki: You may be lucky with Matoi, but you aren't with me.
(Y/N): Wah!
Satsuki appeared behind Y/N, transformed into Junketsu.
Satsuki: No more games. Who are you?
(Y/N): Um... uh... Just a guy with sweaty palms?
Satsuki observed the many scars on Y/N's body. But her eyes were fixed on the chest. The tissue damage there... it wasn't natural. It looked like a wound that should have killed a man instantly.
Satsuki: Internal That wound... it missed the heart by millimeters. Or perhaps it didn't, and he simply refused to die. What kind of monster is he?
(Y/N): Please stop staring...
Satsuki unsheathed her sword and began to walk toward Y/N.
(Y/N): Sweat beads on his palms, crackling slightly I could really use an out right now. ;_;
As if to answer his prayer the Mankanshoku family car crashed in.
Barazo: Barazo Mankanshoku, Back-Alley Doctor, is here!
(Y/N): Yes! We need to take Ryuko back home, she's lost a lot of blood!
Barazo: Right! Get her in the car and we'll get out of here!
Y/N grabbed Ryuko and Mako. He used a small explosion from his feet to launch himself into the back of the Mankanshoku family car.
Mataro: Woah, what happened to your body Y/N? That scar is huge!
(Y/N): Nothing! Just an old war wound! Let's go!
Satsuki: You are not escaping!
Satsuki jumped at the car, Bakuzan raised to cleave it in two.
Y/N blocked her. He caught the blade between his hands.
SIZZLE
His palms were burning hot, the sweat vaporizing against the steel.
Satsuki: Who... grunt are you?
(Y/N): Would you believe me if I said you are dreaming?
Satsuki: No more games!
(Y/N): sweats Worth a shot. Howitzer...
Y/N spun his body violently in mid-air, creating a tornado of smoke and fire.
(Y/N): ...IMPACT!
BOOM!
The centrifugal force and the explosion blasted Satsuki backward, sending her crashing into the arena wall. The recoil launched Y/N perfectly back onto the roof of the escaping car.
Satsuki: No! crash
Satsuki recovered and watched Y/N, Ryuko, and the Mankanshoku family drive away. She glared at Y/N for a moment longer then turned and walked away.
On a ledge overlooking the arena Aikuro and Tsumugu witnessed the events that transpired.
Tsumugu: This can't be real...
Aikuro: I have never seen a person do what he just did.
Tsumugu: Who is he!?
Aikuro: I don't know!
Tsumugu: You don't know!? Not only did he just go toe-to-toe with a berserk Kamui, he launched The Grand Couturier with a point-blank explosion! How do we have no information on this kid!?
Aikuro pulled out his laptop and began to bring up the information he had on Y/N.
Aikuro: Damn. There's nothing here that can explain this.
Tsumugu: Is he wearing a Kamui himself?
Aikuro: No. I've carefully observed his clothes before, he's just wearing a regular school uniform. Besides, you saw his shirt get torn off. He generates those explosions from his own body.
Tsumugu: Those scars... especially the one on his chest. That was a fatal wound. He shouldn't be walking, let alone generating that kind of firepower.
Aikuro: Whoever he is, we need to find out. FAST.
An Hour Later
The Mankanshoku House
Mako: is she gonna be okay dad?
Barazo: Of course! Who do you take me for? She just needs some rest.
(Y/N): That's good news. Small puffs of smoke rise from his hands as he cools down.
Mako: Ah! Y/N! What happened to you? You're covered in scars!
(Y/N): tries to cover himself with a towel Uh... I used to fight a lot.
Mako: Wow! You have 1... 2... 3...-
She poked the massive scar on his chest.
(Y/N): Ow. Don't poke the AFO mark- I mean, the big one.
(Y/N): Stop counting them please. -_-
Mataro: Those must have been some crazy fights! Did you explode yourself?
Sukuyo: They look like they were really painful.
(Y/N): It's fine. Really. I'm gonna head home now, I would very much like a shirt right now, and Ryuko seems safe.
Mako: 23... 24... 25...
(Y/N): Stop it!
That Night
Y/N's No-Star Apartment
Y/N took off what was left of his school uniform—which was basically just pants at this point—and got ready for bed. His thoughts lingered on today's events.
He looked at his palms. They were still slightly smoking.
(Y/N): I really hope I haven't kicked a hornets nest here... -_- I used a Howitzer Impact in public. Maybe I should've worn a mask. Being a retired hero is exhausting.