Ryuichi's first sexual experience goes poorly, and he has been unable to get an erection since then. He takes a job as a janitor at a girls' high school, but his poor work attitude leads to the decision to dismiss him. While depressed upon hearing this news, he meets Midori. He gets an erection while talking to her. Unable to control himself, he rapes her. With only one month left, he decides to spend his time at school raping as many girls as possible....