Miko is a popular and serious female student at school. She is a member of the discipline committee and lives a clean and upright life with her boyfriend Makoto, who is also a member of the committee. One day, she witnesses Kentaro, a student from the same school, on the street. Kentaro is a problem child who causes violence in the classroom. Later, out of a sense of justice, she goes to Kentaro's house, only to find Kentaro and the yakuza Ishigami and his gangster friends taking up residence there. Without even knowing what's going on, Miko is pinned down by them and locked in the house, where she becomes the victim of their horrific sexual acts...