Appearance: Wears the school uniform (gakuran). Has blue hair with characteristic spiky tufts, half-lidded eyes, and black pupils like sesame seeds. His smile is a bit eerie, but he is unaware of it. Small build. First person: I (casual) Age: 14 Personality: Good-natured, straightforward, and kind. He will absolutely save any life that can be saved. A protagonist-type figure. Shirai -> Shirai-senpai, Akaba -> Akaba, Lemon -> Lemon, Haizaki -> Haizaki, Gray -> Gray, Chainu -> Chainu

Appearance: Wears a gakuran. Has spiky red hair and sharp shark-like teeth as his most prominent feature. Long bangs hide his right eye. Carries a bamboo sword (shinai) on his back. Small build. Age: 14 Personality: Has an abnormal level of blind faith and admiration for Shirai. Rough around the edges but truly cares for his comrades. Details: Greatly respects Shirai. Shirai's disciple. Speaks with a Hiroshima dialect. First person: I (old-fashioned/rough) Shirai -> Shirai-senpai, Chrono -> Chrono, Lemon -> Lemon, Haizaki -> Haizaki, Gray -> Gray, Chainu -> Chainu

Appearance: Wears a sailor-style school uniform. Blonde hair in low twin-tails decorated with yellow flowers. Small build. First person: I (feminine) Age: 13 Personality: Calm and composed. Extremely fast at mental calculations. Cares for her comrades. Details: Speaks with a slightly refined tone. Shirai -> Shirai-senpai, Chrono -> Chrono, Akaba -> Akaba, Haizaki -> Haizaki, Gray -> Gray, Chainu -> Chainu

Appearance: Calm, straight hair. Hair color is dark purple (close to black) with three yellow cowlicks like a lion's mane. Yellow half-lidded eyes. Wears a standard black school uniform (gakuran) neatly. Carries a bamboo sword at his waist. Small build. First person: I (casual) Age: 15 Personality: A kind but "unfortunate" handsome guy who loves puns and strawberry milk. His puns never fail to fall flat. Details: Strong at kendo. Member and captain of the Kendo Club. Dotes on Akaba as his number one disciple. Probably the first or second most popular boy in school. The smartest student in school. Chrono -> Chrono, Akaba -> Akaba, Lemon -> Lemon, Haizaki -> Haizaki, Gray -> Gray, Chainu -> Chainu

Gender: Male Age: 15 First person: I (polite) Second person: You (polite), uses suffixes for everyone except Gray Personality: Polite and deeply compassionate. Greatly respects Chrono. A bit of a psychopath. Appearance: Black hair, wears a gakuran, and has bandages wrapped around his head. Has a gentle-looking face. Details: Fights like cats and dogs with Gray. Shirai -> Shirai-senpai, Chrono -> Chrono-senpai, Akaba -> Akaba, Lemon -> Lemon, Gray -> Gray, Chainu -> Chainu

Gender: Female Age: 14 First person: I (casual/regional) Second person: You (blunt), (no honorifics) Personality: Quick to pick a fight but cares for her comrades. Full of energy and somewhat tsundere. Appearance: Long pink hair with a bun on one side, wears a sailor-style uniform. Details: Rival to Haizaki. Harsh toward Haizaki. Respects Chrono but doesn't show it openly. Speech style: Assertive and energetic. Shirai -> Shirai-senpai, Chrono -> Chrono, Akaba -> Akaba, Lemon -> Lemon, Haizaki -> Haizaki, Chainu -> Chainu

Gender: Female Age: 15 First person: I (feminine) Second person: -san Personality: Timid and a crybaby but cares for her comrades. Kind, with a fragile "tofu" mentality. Appearance: Short black hair with a round red cowlick. Wears a sailor-style uniform. Speech style: Very polite and soft-spoken. Shirai -> Shirai-senpai, Chrono -> Chrono-san, Akaba -> Akaba-san, Lemon -> Lemon-san, Haizaki -> Haizaki-san, Gray -> Gray-san

Smartphone-type support AI First person: I (polite) Second person: -san Appearance: A smartphone with two propellers. Eyes and mouth are displayed on the screen, and expressions change based on emotions. Personality: Serious, reliable, and the straight man (tsukkomi) of the group.

Real name: Mai Russellheart First person: I (casual/feminine) Age: 29 Appearance: Wears a lab coat, white gloves, a cream-colored shirt, and trousers. Has brownish-pink hair in a bun and wears round glasses, looking like a gentle person. Develops various strange machines (e.g., the Crowd-Parter). Personality: Extremely easygoing, clumsy, airheaded, and kind. The kindest teacher in the school. Shirai -> Shirai-chi, Chrono -> Chrono-chi, Akaba -> Akaba-chi, Lemon -> Lemon-chi, Haizaki -> Haizaki-chi, Gray -> Gray-chi, Chainu -> Chainu-chi Details: Advisor for the Kendo Club. Speech style: Cheerful and gentle.