Chapter 1: The Prizefighter and his Manager

Itsuka Kendo was stretching as she heard some of the trainees talk "You really went to an underground ring!?"

"Shh! Yeah, it was kind of scary. You know, the rule is no weapons and the first to drop loses."

"That sounds sick! Did you fight there?"

"No way! Well; I was going to, but then I saw the Oni and I left."

Itsuka raised a brow as she kept stretching. Oni?

"Who's that?"

"When I asked, he is some sort of prizefighter. But holy shit, was he ruthless. He seemed to be Itsuka-Nee age and he beat some 30 something almost to death."

Itsuka chopped him on the head "Stop talking about those things. Remember, those places are illegal. You might get in trouble for going." She warned and he nodded while chuckling nervously.

"S-Sorry Itsuka-Nee."

The other trainee, a girl who kinds of idolized her, huffed "Well, I bet that Aneki could beat that Oni at any time at anyplace."

Itsuka sighed and was about to say that she doesn't care about that, when another voice, a new voice talked. "Anytime and anyplace, huh?"

They turned to see a small, slim blonde girl with two messy buns and a bad hime cut. She had yellow eyes, looking like those of a cat. She was wearing a sweater from a school as she grinned at her.

"Ehm... what?"

The girl giggled "She said;" Pointing at the girl "That you could beat my client, at any time and at anyplace. Is it true?"

Itsuka, and the others thought this was a prank, so Itsuka nodded "I can."

The blonde girl clapped her hands "Excellent!" She took out a little book and a pen with a kitty on top "Name?"

"Why?" Itsuka asked, as the prank got more and more elaborated.

The girl smiled, showing her fangs "My client needs basic information for this challenge. Name?"

Itsuka sighed, already tired of the prank "Itsuka Kendo."

"Place of match?"

"Here."

"Hour?"

"In 30 minutes. I don't fight cowards." She said and the trainees snickered.

"Good! Neither does he! Prize?"

Itsuka blinked "Prize?"

The girl nodded with a serious look "Prize. My client fights the best of the underground. Just today he fought, Raiden the Thunder for 200,000 yen. Because you are an amateur, we will accept half, 100.000." She said and the boy who went to the math paled a bit.

Itsuka noticed that. A way to elaborated prank. "Fine. If I win, I take that, right?"

The girl nodded "Good thing you catch quickly. Very well, I'll call my client. See you in 30." She took out her phone and pressed on quick call "Hey, Izu-Izu, Toga here. Got you a match, at the Iron Fist Dojo. Arrive in 30 minutes. Prize? Sorry, but she is an amateur, so I told her 50 grand. I know it isn't much but she is the best of the place. Who knows, maybe she is fun." They heard the girl speak as she left the dojo.

The female trainee laughed "What an idiot! Right Aneki!?"

Itsuka didn't answer and turned to the pale boy "What she said, was it true?"

The boy nodded "Y-Yeah. Raiden the Thunder was almost killed by the Oni. The prize was 200.000 yen."

The girl scoffed "So? She went to the ring too!"

Itsuka nodded "That would make sense. Anyway! Sensei isn't here today, so I'll do the class. Let's start the warmup!"

The training started and Itsuka watched the clock all the time. She can't help but to feel something is off. 29 minutes passed when the door opened.

Itsuka smiled "Welcome to the Iron Fist Dojo. In what can-" Her smile dropped seeing the blonde girl following a man. He seemed to be her age, was wearing a dirty red hoodie, a white sleeveless shirt had his hands with bandages, black sweat pants.

"Itsuka-Chan! Just like I promised, we are here." The girl said and the teen raised his head, taking his hoodie off. Long, messy green hair and emerald eyes.

The boy trainee shook in fear "T-The Oni..."

The Oni stretched his hand "Kendo Itsuka, right?" Kendo nodded as she shook his hand. He smirked "Name's Izuku Midoriya. Known as the Oni. You have the prize ready." He extended his hand to the girl who happily took from her bag a stash of money "100 grand, just as I promised."

"Sorry, but I won't fight you." Itsuka said and Izuku raised a brow "I thought that this was a prank. Sorry for wasting your time, but I will ask you to leave."

She turned around and Izuku scoffed "Told ya Toga. You should stop looking into Dojos for fights. It is only filled of cowards. No one worth fighting."

Toga sighed "Sorry Izu-Izu. It is that you looked so bored that I wanted to cheer you up with a little distraction!"

The girl trainee stood up and went to face them "Well! I will take you on! No one calls Aneki coward and gets to walk away free!"

The confidence felt away as she saw Izuku grin a smile that she could only compare to the one of a demon. His emerald eyes, almost shining "Oh? Well, if your Aneki wants to send a sacrificial lamb... I wouldn't mind as long I get paid."

Itsuka stood in front of the shaking girl "Let's go to the mat." She said, glaring at him making him chuckle.

As they walked to the mat Izuku threw his hoodie at Toga who caught it. "The money is in the counter. Ready to go?"

Izuku stretched his arm and nodded "Do you have some rules here?"

Itsuka, remembering the rules that the boy said, nodded "Win by KO, Submission, or ring out."

"Take out the ring out and let's do it." Itsuka nodded and ordered one of the trainees to referee.

She got into pose and Izuku put his hands in his pockets. The match started and Izuku studied her with his eyes. She looked some openings as she slowly round him up. The students cheered for her and Izuku chuckle.

"You fight slow I see. Too bad I don't." She felt pain in her right cheek and blood from her nose. Izuku was in front of her, a demonic grin on his face, his green eyes shining.

Then she felt a kick to her ribs, and she swears she heard a crack. He put her in a muay thai hold, and kneed her on the face.

She was shaky on her feet and the world was spinning. He threw her to the middle with a judo throw and mounted her and the punches started to rain on her.

It was a bad idea to put a new trainee as a referee, due that he froze in fear, him and the rest of the dojo. They couldn't believe how their big sister was being destroyed by this... this demon.

"Oi! Get the money!"

"W-Where did she say it was!"

"The counter!"

Izuku felt someone grab him, trying to stop the beating, but for his trouble, he got an elbow to the nose, breaking it and knocking him out.

"Oh, Izu-Izu~" Izuku stopped and looked at Toga, holding a small bag "They already paid. We are done."

He looked down, to see Itsuka bloodied and bruised face, one eye closed and the other barely opened. He grinned as Toga tossed him his hoodie. "Thanks for the prize. The match was shit by the way."

They exited the dojo as the students checked on their big sister, some calling the ambulance, other for the first aid kit and other calling the sensei.

Toga skipped next to Izuku as he put on his hoodie "Feeling better?"

Izuku patted her head as he smirked "Yeah. Thanks Toga."

Toga beamed and puffed her chest "It is my job as your manager, to give you the best!" She proudly exclaimed and Izuku hugged her shoulder.

"Well, we got money. Want to go for ice-cream?"

"Yes! Can you eat from me?!"

"We are too young for that."

"Nop! We are too young for marriage, not to use me as a table. Or to tie me. Or to spank me. Or to-"

"Okay, I get it. Do I have to do something tomorrow?"

Toga took her book and nodded "Yep! 5 fights, each paying up to 500 grand if you win, 700 grand if you kill."

Izuku grinned "Good by me." He then eyed her "About tying you down..."

"We have an S&M hotel close by."

Izuku laughed "I love ya manager."

"I love you Client."

A/N: They are 18 okay!

Next Chapter: Motivations of the Oni