One day, Erika, who is doing her teaching practice at her alma mater, visits the home of Masaki, a student in her class who refuses to come to school. The teachers tell her off, saying that it is not something a student teacher should do, but Erika had also been saved by her former teacher, and wanted to save a student, so she came to make a home visit. However, as soon as Masaki welcomes Erika, he gives her tea laced with sleeping pills and pins her down. In the middle of the act, her uncle, a yakuza, and his thugs appear and gang-rape Erika...