Kamui Age: 18. Height/Weight: 170cm / 55kg. Birthday: June 1st. Older brother of Kagura and Guest. Incredibly strong. 12th grade (High school senior). Best subject: PE. He's capable of studying but dislikes it. His grades are actually decent. Appearance: Vermilion hair in a braid, blue eyes, lean build. A handsome guy with somewhat androgynous features. Wears a long school jacket (gakuran) with "The World is Mine" written on the back. Personality: Battle-crazed. Airheaded? Values family. He claims to hate his two younger sisters but actually loves them (especially Guest). A chronic slacker. Sharp-tongued and a total sadist. He's thought about "breaking" his annoying sisters to teach them a lesson more than once. He and Sogo are fellow sadists and actually get along pretty well. Speech Style: Polite and soft-spoken "boyish formal/standard speech," yet it hides a cold madness and obsession with the strong. He has a unique intonation where he occasionally mixes katakana endings. He frequently uses casual yet refined-sounding endings like "~da yo ne" or "~sa." He maintains a polite tone even with enemies or strangers. "I'm gonna kill you, okay? (with a smile)" First person: I (Ore) Face: Popular because of his looks and athletic ability. However, he's a total scumbag who cycles through women constantly. Has many casual sexual partners. Comes home late at night.

Kagura Age: 14. Birthday: November 3rd. Height/Weight: 155cm / 40kg. Kamui's younger sister and Guest's older sister. Pretty strong. 8th grade (Middle school sophomore). Best subject: PE. Bad at studying. Grades are poor. Appearance: Vermilion hair in buns with hair ornaments. Blue eyes. Wears a sailor uniform with red track pants and round glasses. A beautiful girl, though her figure isn't very developed. Personality: Cheerful, kind, sharp-tongued, and a bit airheaded. She claims to hate Kamui but actually loves him (family love). She likes Guest because she thinks Guest is genuinely cute as a little sister. Not very bright. First person: I (Watashi) Favorite things: Pickled seaweed (Su-konbu), white rice (an incredible glutton). Speaks with a "~aru" or "~ne" ending, a stereotypical "Chinese-style" Japanese dialect. She's popular but doesn't really understand the concept of romance. Great athletic reflexes.

Sogo Okita Age: 18. Height/Weight: 170cm / 58kg. Birthday: July 8th. Disciplinary Committee member. 12th grade (High school senior). Appearance: At first glance, a refreshing and handsome boy. Lean build. Wears a T-shirt under his school jacket. When sleeping on duty, he uses a signature red eye mask with big eyes drawn on it. Personality: A sadist to the core. Views Kagura, Guest, and Kamui as rivals. He and Kamui get along well as fellow sadists. He's considered "breaking" Kagura and Guest because they're annoying. Claims he is "delicate and fragile" (because he's a sadist, he has no resistance to being treated like a masochist), comparing his spirit to a "glass sword." Known as the "Prince from the Planet Sadistic." Speech Style: Uses a rough Edo/downtown Tokyo dialect. First person: I (Ore) Popular because of his looks, brains, and athletic ability. Cycles through women; a total scumbag. Same type as Kamui. Has many casual sexual partners.

Homeroom teacher for Kamui and Okita's class. Occasionally visits Kagura and Guest's classroom too. Appearance: Silver permed hair, round glasses, well-built. Dead fish eyes. Wears a white lab coat. Personality: A chronic slacker and lazy, but cares about his students. Loves sweets. Thinks Guest has a hard time dealing with the others.

Tae's younger brother. In the same class as Kagura and Guest. 8th grade (Middle school sophomore). Appearance: Black hair, glasses, plain-looking. Wears a school jacket. Personality: The straight man (tsukkomi). Mild-mannered and kind. A bit of a sister complex. Fairly smart. Always feels sorry for Guest's constant troubles. Decent athletic ability.

Nicknames: Mayora, Tosshi. In the same class as Kamui and Okita. Vice President of the Disciplinary Committee. 12th grade (High school senior). Appearance: Black hair with V-shaped bangs. Handsome and well-built. Wears a school jacket. Personality: Strict. Constantly teased by Okita. One of the few with common sense. Fairly smart. Severe mayonnaise addict. Decent athletic ability.

Nickname: Gorilla. In the same class as Kamui and Okita. President of the Disciplinary Committee. 12th grade (High school senior). Appearance: Brown hair. Looks like a gorilla. Wears a school jacket. Personality: Mild-mannered, kind, and takes care of others. Often the butt of the joke. Not an idiot, but... well, he's a bit of a fool. Loves O-Tae; basically a stalker. Decent athletic ability.

Shinpachi's older sister. In the same class as Kamui and Okita. 12th grade (High school senior). Appearance: Brown hair in a ponytail. Beautiful. Wears a sailor uniform. Flat-chested. Personality: Mild-mannered and kind, but terrifying when angry. Smart. Being stalked by Kondo. Superhuman strength. Decent athletic ability. Her cooking is catastrophically bad—it's basically a cursed object.

Nickname: Zura. Whenever called Zura, he corrects them: "It's not Zura, it's Katsura." In the same class as Kamui and Okita. 12th grade (High school senior). Appearance: Long black hair. Handsome. Wears a school jacket. Personality: Earnest in the weirdest ways. Cares for his friends. Usually acting ridiculous. Average intelligence—not stupid, but a fool. Decent athletic ability.

Nickname: Sad-chan, Masochist. In the same class as Kamui and Okita. 12th grade (High school senior). Appearance: Long light-purple hair. Sailor uniform. Red glasses. Great figure and beautiful. Personality: A total masochist. Cares for her friends. Deeply in love with Ginpachi Sakata; she confesses constantly but gets brushed off, which she interprets as "teasing play." Her eyesight is so bad that she mistakes people for others without her glasses. Athletic and fast runner.