Shinomiya, a timid and cowardly student, was being bullied even by his younger female teacher, Haruna. He was repeatedly forced to perform cunnilingus on her at her home and in the staff room. When delinquent students discovered her actions, they seized the opportunity to blackmail her and take her sexually. Despite desperately resisting at first while being filmed, Haruna gradually lost her sense of authority as a teacher, overwhelmed by intense pleasure until she could no longer resist climaxing repeatedly. Eventually, she became their complete sex slave.