After a party, Yumi Hayama, a young female school teacher is pulled by Kyoto, another school teacher and tries to have sex with her. However, the drug he put in her drink didn\'t work at all so she fled the scene. Later Yoshioka, a student from her class persuades Yumi to give a talk to Keiko Fujiwara, his \"girlfriend\" who refuses to go back to her parent\'s house. But, she falls in a trap set by Gondo, another of her student and Kyoto. They raped her and Yoshioka videotapes the hole scene. From now on, Yumi will be a \"washroom for them\" after classes are over. Yoshioka is disgusted at what he saw but he can\'t do anything about it because Kyoto would do something bad to Keiko if he betrays them. Will Yoshioka found a way to save Yumi and protect Keioko ??? Or will Yumi be Kyoto and Godo sex machine forever ???