Rin, a teacher, teaches a class where a student named Takao has been absent from school for nearly a year. Feeling responsible for the situation he finds himself in, Rin goes to visit Takao's home accompanied by her husband and fellow teacher Keiichi. However, Takao's house is a den of men who run a vicious yakuza business. Rin's beauty catches her eye, and she is pinned down by Takao and his family, and is reduced to an endless, intense sexual act in front of Keiichi...