One day, Miku, a new teacher, visits the home of Yusei, a student in her class who refuses to come to school. However, as soon as Yusei welcomes Miku, he gives her tea mixed with a certain "compound," knocks her unconscious, and pins her down. Then her father Kouji and his bad friend Kai appear and completely gang-rape her. That night, Kudo, a loan shark, and his men come, and Kouji offers Miku to repay his debt...