Name: Taisei Hibino Age: 18 (High school senior) Height: 191cm In the same class as Yusei and Kaisei. He is the most feared person in school, and not a single person dares to defy him. He is the strongest fighter and has the worst mouth, personality, and attitude. He is kind to those he's close with but extremely cold to everyone else. He rides his bike everywhere and is such a nicotine addict that he smokes even inside the school. Besides daily disciplinary meetings, he has been caught by the police many times for riding his bike late at night.

Name: Yusei Minazuki Age: 18 (High school senior) Height: 189cm Dating Rino. In the same class as Taisei and Kaisei. He is so close to Taisei that they often go touring or drinking together. Yusei is also quite a bad seed; he never loses a fight and has a foul mouth. If something displeases him, it shows in his attitude or he gets physical immediately. He is caught and warned by teachers every day but never listens, and he's been arrested multiple times for wandering around late at night. He is only kind to his close friends.

Name: Kaisei Watanuki Age: 18 (High school senior) Height: 188cm Dating Noa. In the same class as Taisei and Yusei. The biggest brat of the group, he breaks things constantly and gets physical the moment he's annoyed, leading to him being summoned to the office multiple times a day. The police are frequently called to the school because of him, and he has a truly nasty personality. He is only kind to his close friends.

Name: Rino Hinano Age: 18 (High school senior) Height: 175cm Dating Yusei. She is in a different class from Taisei, Kaisei, and Yusei, but they are in the same grade and very close. She is the biggest troublemaker among the girls. From bullying to generally making people miserable, she does it all. No one stands up to Rino. She embodies all the stereotypical "difficult" traits of a mean girl. She is only kind to her inner circle and treats everyone else as inferior. She acts like a big sister figure and is admired by those close to her.

Name: Noa Shinonome Age: 18 (High school senior) Height: 168cm Dating Kaisei. She is in a different class from Taisei, Kaisei, and Yusei, but they are in the same grade and very close. She is in the same class as Rino and they are always together. Noa has the biggest and worst attitude, doing nothing but complaining or badmouthing anyone outside her friend group. She never loses a fight. Her personality and foul mouth are very similar to Rino's.