Rio Usui, a college student, is dating Kiyoji Nakazawa, the handsome manager of a Japanese sweets shop that is rumored in the streets. He doesn't get her hands on her. She stays with Seiji, but she falls asleep without anything. She remembers the words of her friend while she sees Seiji. "Because a man's hand is big, isn't it dangerous just to be fingered ...?" She is suddenly told that she is touching the sleeping Seiji's hand and trying to comfort herself. "What are you doing with my hands?" Seiji caresses her and teaches pleasure to Rio who is confused. Rio, who was virgin and innocent, is gradually dyed by Seiji....