Rena spent her days as a member of the school's disciplinary committee, upholding the rules and maintaining order. Alongside her boyfriend Meguro, who also served on the committee and supported her, she lived an upright and proper life. One day, a fellow student named Kawagoe was caught repeatedly committing misconduct—secretly photographing female students during class and instigating violent altercations inside the classroom. When Rena confronted him about his actions, Kawagoe ignored her warnings. Later, he called her, saying, "Come to the place I'm about to tell you, and I'll listen to what you have to say." Though suspicious, Rena headed to the location he specified, accompanied by Meguro. However, the place turned out to be a hideout where Kawagoe and his gang of delinquent friends gathered to carry out their crimes. Rena soon found herself in a far more dangerous and brutal situation than she could have ever imagined.