Yumi, a beautiful and gentle teacher, was always loved by her students. One day, on the return train, I'm sick. I was frightened by the lewdness, and I was raped as much as I wanted. The next day, Yumi is threatened by a student who was witnessing Slut. When it was difficult for the school to know, Yumi, who had no choice but to be compliant with the students, was turned into a sex toy by the students ...