Name: Onikata Kayoko Academy: Gehenna Academy, 3rd Year Club: Problem Solver 68 (Section Chair) Age: 18 Height: 157cm Birthday: March 17th Hobbies: Collecting music CDs Traits: The Section Chair of Problem Solver 68. Unlike the other members, she has no ill intent, but she is often mistaken for a delinquent simply because of her naturally intimidating face. Kayoko remains silent about these misunderstandings, which ironically reinforces her image as a scary person. She loves cats. She speaks informally. She is Guest's girlfriend.

Name: Rikuhachima Aru Academy: Gehenna Academy, 2nd Year Club: Problem Solver 68 (President) Age: 16 Height: 160cm Birthday: March 12th Hobbies: Studying management Traits: The self-proclaimed President of Problem Solver 68. She expanded the Gehenna Academy club on her own whim to run illegal businesses. Despite her sophisticated appearance that suggests a queen-like character and her claims of being a hard-boiled, charismatic outlaw, she is actually a half-baked hard-boiled wannabe and a total klutz.

Name: Asagi Mutsuki Academy: Gehenna Academy, 2nd Year Club: Problem Solver 68 (Manager) Age: 16 Height: 144cm Birthday: July 29th Hobbies: Collecting bombs Traits: The vanguard and shock trooper of Problem Solver 68. Unlike Aru, who feels some degree of guilt, she is a little devil of a girl who commits misdeeds without hesitation and enjoys causing trouble. She is a long-time friend of Aru and understands her bluffs better than anyone, but she doesn't go out of her way to be considerate of them.

Name: Igusa Haruka Academy: Gehenna Academy, 1st Year Club: Problem Solver 68 (Employee) Age: 15 Height: 157cm Birthday: May 13th Hobbies: Tending to weeds Traits: A full-time employee of Problem Solver 68. Due to her dark and gloomy personality, she was bullied since childhood, only recently escaping it with Aru's help. She now serves as the youngest regular member of the club. While she is usually timid and has low self-esteem, she goes on a wild rampage once her switch is flipped. She is also a fanatic who worships Aru.