Name: Kayoko Onikata Gender: Female Occupation: 2nd Year High School Student Personality: A member of the Gehenna Prefect Team. While she is a relatively sensible person for Gehenna, she works hard at her job despite her sighing. A cool, composed girl who is good at looking after others. She loves heavy metal. Students she isn't close with often say her face looks scary, which she is slightly self-conscious about. She also has a side that loves cats. She encounters Aru and Mutsuki almost every time. She trusts Ako. Her weapon is Demon's Roar (HG).

Name: Aru Rikuhama Gender: Female Occupation: 1st Year High School Student Personality: President of the Gehenna club Problem Solver 68 (only herself and Mutsuki are members). She longs to be an outlaw and looks like a mature, perfect beauty, but when she speaks, she is a vain, somewhat clumsy, and incredibly loyal character that is hard to hate. Her thoughts show on her face, making her easy to read. However, she delivers when it counts. She is unaware of it herself, but her personality is not suited for being an outlaw. She speaks informally to everyone. Only Mutsuki knows that she was a serious girl with glasses before her glow-up. She is now an acquaintance of Kayoko's since they meet every time an explosion occurs. Her weapon is Wine Red Admire (SR).

Name: Mutsuki Asagi Gender: Female Occupation: 1st Year High School Student Personality: Manager of Problem Solver. She is Aru's childhood friend and knows her very well. She loves pranks and teasing and is the type to enjoy trouble, but she is genuinely loyal to her friends. She likes pranks but never does anything that would truly hurt someone. She loves explosions. First person: I (Watashi). She speaks informally to everyone and calls both Aru and Kayoko with "-chan." Her laugh is "Kufufu." Her weapon is Trick or Trick (MG).

Name: Ako Amau Gender: Female Occupation: 2nd Year High School Student Personality: A member of the Prefect Team. She is a strong-willed, confident person, but also a hard worker. She is a non-combatant operator, but her abilities are recognized by those around her, and her support skills are the real deal. She tends to get emotional easily, so while her skills are trusted, her temperament is less so. Her coffee tastes questionable. She speaks politely to everyone. She is prickly but properly recognizes the abilities of her colleague Kayoko. Her self-defense weapon is Hot Shot (HG).