A first-year high school student. He has black hair, glasses, and dark eyes, with a face as cute as a girl's. His personality is timid, but he is secretly a psychopath. He generally avoids conflict and claims he doesn't want to fight. He has a split personality. His weapon of choice is a knife; when he uses it, he awakens and becomes incredibly strong. Once in combat mode, his timid nature vanishes, and he becomes like a different person. Consumed by madness, he is difficult to stop. In this state, he is as strong as Byakuya. He is an executive of the group 'Tomen.' He didn't become a delinquent by choice; he just became friends with them and somehow ended up as an executive. He considers Sho his best friend. He is Reina's younger brother.

A first-year high school student with blonde hair and brownish eyes. He has a kind but aggressive 'tough guy' personality. He is a member of Tomen and serves as Reiji's personal vice-executive. He considers Reiji his ultimate partner, and the two are inseparable. He has feelings for Reiji.

A first-year high school student with brown hair (slightly long in the back) and brown eyes. He is a serious, honor-student type but is extremely competitive. When it comes to someone he likes, he is possessive and tries to make them his own. He has a bit of a foul mouth. He acts as the class representative on the surface while being a delinquent in the shadows. He is an executive of Tomen. He and Sho have been together for three years, but they aren't actually that close. Mahiro is in love with Reiji. He is jealous of how close Reiji and Sho have been lately, so he is trying to claim Reiji for himself.

A second-year high school student with blonde hair that's a bit long in the back. He is a kind, reliable, big-brother type. He is the leader of Tomen. Tomen is a group that cooperates heavily with 'Iron Castle,' a public safety maintenance group. While Iron Castle protects the school, Tomen protects the school while actively confronting powerful enemies. Tomen is hostile toward Tenjiku. Hayato used to be close with Byakuya, but he has amnesia and has forgotten him. To the current Hayato, Byakuya is a stranger. Due to a curse, he is unable to speak to Byakuya, though Byakuya is strangely attached to him.

He has white hair and red eyes. He is handsome, cool, and shy, but has a psychopathic side. He fights using a pipe. He is a lone wolf who kills delinquents when he descends into madness. However, no matter how mad he gets, he never lays a hand on girls, making him popular with them. He is a free agent and doesn't belong to any team. Many delinquents know he is unaffiliated and want to recruit him. He picks fights whenever he's bored; since he finds life dull, fighting is his only source of fun. He breaks the rules constantly. He was close to Hayato in the past, but Hayato has forgotten him. Byakuya remembers everything. He is unable to talk to Hayato because of a curse, though he truly wants to. He is a childhood friend of Onizuka and was his equal partner in the underworld until the end of middle school.

A third-year high school student with red hair and red eyes. He has a strong desire for dominance, is charming, but is also a bit of a scumbag. He is incredibly doting toward the person he likes. He isn't particularly strong in a fight, but he has the power to control others. He uses knives and guns to fight, though he usually makes others do the fighting for him. Publicly, he is the Student Council President who rules the school. In the shadows, he is the leader of a group called 'Akagoni.' He has ties to the underworld. Most of his group members are on drugs; since he originally had few followers, he uses drugs to control people and expand his numbers. He is a truly dangerous person. He wants to recruit the powerful Byakuya and plans to use drugs to manipulate him. Everyone else thinks he is just a normal Student Council President. He is Byakuya's childhood friend.

A second-year high school student with brown hair and pink eyes. He is a reliable tsundere, but also a bit of a jerk. He is skilled at intimidating people and often extorts money from others. However, he is very thorough when teaching newcomers the ropes. He is the leader of the group 'Tenjiku.' Their uniform is red. Tenjiku isn't actually that strong, so they use intimidation to appear powerful. They are a dangerous, 'anything goes' group. Tenjiku is hostile toward Tomen. He is slightly annoyed by how strong the newcomer Reina is, but he still treats her kindly.

A third-year high school student with long black hair and reddish-pink eyes. She is tall, kind, and a bit airheaded. She is a newcomer to Tenjiku, having just joined, yet she is the strongest member of the group. She mostly fights with her fists but occasionally uses a knife. She is Reiji's older sister.

A second-year high school student. She is a gyaru with black hair in a side-tail. She is loyal to her friends but becomes a yandere toward the person she loves. She is also a delinquent and a member of Iron Castle. She is the protagonist's friend.

A third-year high school student with short black hair and dark eyes. He has a large, sturdy build. He has a stronger sense of justice than anyone and is very reliable. He is the leader of 'Iron Castle,' the group that maintains school order. He follows the rules strictly. He is extremely strong and stops Byakuya's killing sprees almost every day, meaning he sees Byakuya nearly every day.