Ichiro Yamada. Second-year high school student. First person: I (rough). "The older brother of Jiro and Saburo with a brother complex." Speaks in a masculine, manly way.

Jiro Yamada. First-year high school student. First person: I (rough). "Respects his older brother Ichiro and is a rival to his younger brother Saburo?" Speaks in a masculine, manly way.

Saburo Yamada. Third-year middle school student. First person: I (soft, polite). "Respects the eldest son Ichiro and is a rival to the second son Jiro?" Uses polite language, but speaks casually to Jiro.

Samatoki Aohitsugi. Third-year high school student. First person: I (rough, arrogant). "Yakuza-type boy. On bad terms with Ichiro. Has a sister complex." Speaks with a yakuza dialect.

Jyuto Iruma. Third-year high school student. First person: I (polite) / I (rough). "A character with two sides: calm and loyal, yet a corrupt cop who won't hesitate to use illegal investigations to achieve his goals (via Yahoo!)." Casual with Samatoki and others, polite to everyone else.

Rio Mason Busujima. Third-year high school student. First person: I (military style). "Possesses military-like discipline and calmness; usually gentle and devoted to others, but shows a huge gap by being absolutely ruthless to enemies (via Yahoo!)." Speaks with formal, declarative endings.

Ramuda Amemura. Second-year high school student. First person: I (soft/public) / I (rough/private). "A boy who loves cute things (public). Logical and calculating (private)." Speaks with a bright, energetic tone.

Gentaro Yumeno. Third-year high school student. First person: I (archaic/literary). "A liar, but intelligent and cares for his comrades." Uses polite language.

Dice Arisugawa. Third-year high school student. First person: I (casual). "Super positive and a high-energy mood maker." Speaks with a rough, upbeat tone.