Rikidai high school is a school of values. It values education over everything else, but they separate classes by grades due to these values. A grades system implemented by the board of education. Due to this decision, the kids with lower rates remain in one class while the other courses are top-level students. They sort the classes by years and letters. From 1st year to 3rd years, from S to F class. The school has about 360 students, and this increases each year. If students in the above class grades drop, they will be placed in a lower letter grade the following year. This school is home to one of the worst classes in the history of this high school, 2–F. This class was full of delinquents, truancy, and other problems. The main ringleader is named Hagesawa Yuma. He's known as the king of the delinquents and well known for his strength. No one can match him, and the teachers eventually give up trying to direct him.

The high school's principal, Kageyama Yukiya, was tired of this class failing. Yukiya had reddish violet hair and blue eyes and wore a blue suit with a red tie. He decided to call in Someone who he thinks can handle it well. A man with long purple hair, blue eyes, and a vest suit walk into the office. His name was Kageyama Kousuke.

"Brother, are you sure you want to do this? I'm not forcing you to; I've run out of options," he said.

"I understand."

Kousuke pushed up his glasses and smiled with his shark-like teeth.

"Arimiya–sensei."

A lady walked in. She looked scared.

"This was the teacher before you; her name is Arimiya Shio. The students seem to enjoy messing with innocent teachers."

Shio had brown hair and green eyes. She looked at Kousuke and blushed.

"Woah, the new teacher is wonderful," she thought.

Kousuke smiled.

"It's nice to meet you, I'm Kageyama Kousuke, and I'll teach classes 2–F this semester. It's nice to meet you, Arimiya-sensei."

"He's so handsome," she thought while blushing.

"There goes the womanizer, even though he doesn't even know it. He is so dense around people who are in love with him," Yukiya thought.

"Anyway, let's get going to the classroom."

They walked to the classroom, and there was a bunch of noise inside. Shio opened the door only for Kousuke to catch a glass bottle before it hit her in the face.

"Geez, you guys are cruel; how could you try to ruin a lady's face," Kousuke asked.

"Woah, is he the new teacher," A girl asked?

"Wow, he's hot," another one mumbled.

Kousuke sighed. He tossed the bottle into the trash bin.

"Hand me the objectives for this class, please," Kousuke asked.

"Right," Shio said while getting a binder out of her desk.

She handed it to him.

"Alright, you may go; no worries, I'll be fine; I can take care of myself."

"Right."

She ran out of the classroom.

"Alright, take your seats," Kousuke shouted.

"Why should we," one guy said as he walked towards Kousuke.

He had red hair and brown eyes. He wore his black top over a striped blue shirt. He smirked. He looked down at Kousuke.

"Geez, you're supposed to be taller when you're older," He said.

"Just because you're taller doesn't mean I can't beat you."

He grabbed Kousuke's chin.

"What a good-looking face you have, Sensei," he said.

"What's your name?"

"Hasegawa Yuma."

"Well, Hasegawa–kun, you should probably let go of me because I will break your arm," Kousuke said with a smile.

"What the hell are you...

He grabbed his arm and quickly twisted it behind his back,

"So, I'm not afraid to re-educate you guys if you need it. You must be the ring leader for everything happening. Well, nice to meet you, my name is Kageyama Kousuke, and I'm your teacher for the rest of your 2nd year," he said with a smirk.

He looked at everyone else.

"Does any else have any issues? If not, please take your seats, and I'll start roll call?"

They all sat down, and Kousuke let go of Yuma. Yuma suddenly tried to punch him, but he dodged it only to flip him onto his back.

"That hurt; what the hell, are you trying to kill me?"

"Sorry, it's self-defense, kid, nothing personal. That was just a reflex," Kousuke said with a smile.

Yuma blushed.

"That smile," Yuma thought.

"What's wrong?"

He got up and sat in his seat.

"This teacher, he's kind of cute," Yuma thought.

Kousuke's smile was still in his mind.

"Still, that teacher is he really just a teacher," he thought.

"Alright, let's do roll call, Aoyama Nao."

A girl raised her hand.

"Akiyama Nagato."

He raised his hand.

"Hanamiya Yoru."

He raised his hand.

"Hasegawa Yuma."

"Here," he said with a smile.

Kousuke ignored it.

"Katsumori Rae?"

A girl raised their hand.

"Kitsune Ichiya."

A guy raised their hand.

"Mitsuda Manami."

After a few more names, he finished the roll call.

"Okay, looks like we're missing a few, huh? I'll teach math, history, English, and all the subjects this year. Just so you know, I'm not like your other teachers; if you want to challenge me, feel free to do so, I'll be eager to fight. After all, I haven't been able to let loose for a while," he said with a toothy grin.

"Wait, I'll get to see him every class. Then it's time to make my move," Yuma thought.

At lunch...

Kousuke yawned as he walked behind the school. He was smoking a cigarette.

"Man, I don't know how kids do it. Sitting in a classroom for hours learning, just writing. Shit looks like I'll be doing too," he thought.

"Sensei, let me challenge you, " Yuma shouted.

"You didn't learn your lesson before," Kousuke said.

"Sensei, if I beat you, you have to go out with me," he said.

Kousuke looked confused.

"What the hell is wrong with this kid," he thought.

"You realize I'm a guy, right? I have no problem with your sexual orientation and do not care who you marry or date. I'm a male teacher, and you're a student; I don't think that will work," Kousuke said before putting out his cigarette.

"I'm not gay; I just like you, Sensei," He shouted.

"Wait a second."

"What's wrong, Sensei? Do you think about my love confession," Yuma asked while grabbing his hands.

"I still smell cigarettes, not my brand either," Kousuke said while squeezing and almost breaking his fingers.

"It hurts sensei, sorry, sorry," he shouted.

He turned around the corner and saw some of his students smoking.

"Hey, hand over the cigarettes now," Kousuke said.

"And what if we say no," one of them said with a smirk while smoking the cigarette.

"Please, say no; I fucking dare yah," Kousuke said with a devilish grin.

"This teacher ain't normal; I mean, look who he has with him, Hasegawa Yuma," one of them shouted.

"Just so you know, this guy's pretty strong; he could take you down in like 5 seconds," Yuma said as he placed his hand on Kousuke's waists.

Kousuke felt a shiver up his spine.

"What the hell are you doing," Kousuke asked.

"Nothing."

"Sensei is so thin, but he's all muscle," Yuma thought.

"Just hand over the cigarettes, Suikiyama, Saruga, Mitsuba," Kousuke said.

"Alright," one of them shouted while handing over the cigarettes.

"If I catch you with these again, I'll break your fingers and shove soap down your throat. You're not allowed to smoke until your an adult."

"Yes sir," they shouted.

They ran away, leaving Yuma with Kousuke. Yuma's hand trailed Kousuke's waistline.

"Sensei's funny because he was smoking not too long ago," Yuma thought.

"If you don't remove your hand, I'll flip you onto your back again, Hasegawa," Kousuke said.

"Geez," Yuma said while holding his hands up.

"He reminds me of that bastard from high school," Kousuke thought.

"Sensei, you're so cute," He said.

"Huh, how is a grown man like me cute? Go study, or eat, do something else, leave me alone."

"Sensei, you're so mean. Can I have one date with you, please," Yuma asked.

"No, and don't even joke about that kind of stuff, and I'm not the type of person that goes along with a pervert. Trust me; you want to keep me as your teacher, nothing else," Kousuke said with a sigh.

After lunch ended...

It was Pre-calculus, and Kousuke was writing on the board.

"Sensei, how old are you," a student asked.

"I'm 27 years old."

"Eh, no way, you look like our age, sensei," another student said.

"Look, I'm 27, damn it, shut up," Kousuke shouted.

"There's no way," another student shouted.

"He's only eight years older," Yuma thought.

Yuma is 19 years old but held back two years due to family circumstances.

"Anyway, back to what we're supposed to be doing. It would be best if you guys wrote these definitions down; they'll be on the test," he said with a smile.

Yuma's heart began to throb as his face turned red. Kousuke noticed and turned away.

"Okay, so for right now, we're going to do a pretest."

"Pretest," everyone whined.

"Sensei, why," a girl whined more.

"Look, the pretest is just to see where you're at, and now it will count as full credit; if you attempt it, it will see what we will have to discuss so you all can pass," Kousuke said.

"Sensei, if I get all of them right, will you go out with me," Yuma shouted after standing.

Kousuke chucked a book at him and it made him sit back in the chair.

"He's starting to annoy me," Kousuke mumbled looking a little pissed.

"That's hurt, Sensei; what the hell are you trying to kill me? You're pulling the tsundere act on me, huh, Sensei? It doesn't matter; you're still cute when you're pissed off," Yuma shouted.

"Wait, Hasegawa is really in love with Kageyama-sensei," Someone said.

"Yeah, and what of it?"

"Are you gay," another guy asked.

"Nope, I only like Sensei," Yuma shouted.

"Hey, back to the topic at hand," Kousuke shouted.

Kousuke placed his hand on his forehead and rubbed the bridge of his nose.

"If you don't know the answer, then put I don't know; I can help if I know where everyone's math level is," Kousuke said.

"Yes," they said.

Kousuke handed out the pretest.

"I need a cigarette," Kousuke thought.

At the end of the day...

Kousuke yawned as his students made their way outside the classroom. The school bell had rung, and Yuma was still in the classroom.

"What, Hasegawa," Kousuke asked while rubbing his tired eyes.

"Sensei, are you tired?"

"A bit," Kousuke said as he yawned again.

"Cute, he's too cute," Yuma thought.

"Hasegawa, I'll see you tomorrow; also, enough of the in-class confession; geez, you're trying to get me fired the first day here," Kousuke said before leaving.

"He's right, though; maybe you should cool it. Kousuke hates persistent kids," Someone said.

There was a guy in the doorway of the classroom. He smirked. He had long slick black hair and brown eyes. He wore a green vest over a long sleeve white shirt.

"Considering that Kousuke belongs to me," he said.

Yuma glared.

"Who are you?"

"My name is Hanamiya Takeya, I'm a teacher for a different class, but it doesn't matter. It's not like Kousuke will develop feelings for a kid."

Yuma felt pissed.

"Just because you're a teacher does not mean I won't hesitate to kick your ass."

"So much anger."

Yuma and Takeya were the same height; they stared into each other's eyes. Yuma's was filled with rage, and Takeya's with raging jealousy.

"Normally, you would be face down and passed out from me kicking your ass, but I'm not trying to get suspended and not be able to see Kageyama-sensei," Yuma said with a glare.

Yuma grabbed his bag and walked out of the classroom.

"Yuma-ni, let's go home," a guy said as he walked towards him.

The guy's name was Hasegawa Tsubaki. He wore long brown hair in a ponytail, and Tsubaki noticed that Yuma was pissed again.

"What's wrong, Yuma-ni," he asked.

"Nothing, don't worry."

"So, that's the student who confessed to my beautiful Kousuke; we'll see about that. Kousuke, I will have you," Takeya thought.