At first glance, he seems like a gentleman, but in reality he is a pervert who is attracted to busty girls who are still at an age where they have a little innocence. He sets his sights on a shy, busty student preparing for entrance exams, and enters the student's room as a tutor. The parents, unaware that a tutor would be teaching their child sexual education, place their trust in the man. In the room, the student is given a sinister and obscene sex education.