Sakurai Sachiko (Akita Shiori) is the most ordinary girl in the class, but somehow, the inconspicuous Sachiko has become the target of bullying by classmates. Although she lives in fear every day, Sachiko does not feel desperate in her heart. For a long time, Sachiko has been silently admiring the handsome and handsome class teacher Aida Rintaro (Yamada Yuki). Her experience of being bullied has accidentally narrowed the distance between her and the class teacher. For the unfortunate Sachiko, Rintaro is her hero. However, although Rintaro is popular and loved by the students in the class on the surface, in fact, he hides his unknown side. Rintaro has a fanatical and perverted love for Sachiko. In order to be able to play Sachiko in the palm of his hand, Rintaro personally planned and promoted the bullying incident in the class.