Junko, raised in a wealthy home, excels in her studies despite her parents' intense pressure. However, she has an abnormal obsession with sex and is a super perverted schoolgirl. One day, her tutor goes on maternity leave, and a male substitute tutor comes to help with her studies. Junko, who has never had a proper conversation with a boy, is more interested in the tutor's body than her studies. What happens to the tutor targeted by the perverted schoolgirl?