STARS-839 Tomorrow, I'm going to use a vibrator in my homeroom class, so come and watch! A new gym teacher, Saki Shinkai, gets raped by a male student during class.

Saki has been appointed as a new teacher. She is an athletic student who clashes head-on with her students, and she tries to teach them passionately, but as the days pass, she gradually becomes annoyed by her students. She spends her days trying to face the students as a teacher even though she is being bullied... But before she knows it, the positions of the students and the teacher are reversed... A school life that she cannot escape begins...