Satoshi falls in love with his friend's mother, Maki. Unable to control his swelling feelings, he impulsively picks up her underwear, only to be caught by her. The embarrassment creates distance between them, but Maki later teaches the inexperienced adult Satoshi, who does not even know how to masturbate, how to relieve himself. Overwhelmed by his first taste of pleasure, he pins her down. As he pounds her again and again with the frenzy of an animal, Maki's body can no longer resist the waves of pleasure.