A girl caught in the temptation of raw sex. "I don't know, but ... I want to do etch" The student chairman who is overreacting to sex in adolescence goes to the summer sea. A little girl who doesn't know what it is to get along with her will repeatedly go out of the house. No one knows the true feelings of Natsuumi, who is growing up leaving a man behind, and time passes. "I don't think he knows me, after all."