A young boy, a prep school student, lives alone with his estranged mother. One day, after breaking up with his girlfriend Noriko, he is stopped by a middle-aged woman. Out of curiosity, he follows her and has his first sexual experience. A few days later, having discovered the pleasure of sex, he tries to embrace Noriko in a park, but she rejects him, and they part ways. He gradually becomes more and more reckless. He visits his father's mistress and learns that the two have broken up, and ends up sleeping with her. While continuing this life of rampant pleasure, he learns from a friend that his girlfriend Noriko has been attacked and raped by a thug. At that moment, he realizes that Noriko was the only one he truly loved, and he searches for her...