Events in the cohabitation life with the stepchild of a remarried partner. A good age for a girl's school student and defenselessness unique to that age. The panty flash that keeps peeking into the field of vision shakes the reason and eventually reaches out to his father-in-law. The girl, who never thought she would be raped by her new father, is betrayed by the man she was beginning to trust and receives a terrible life-long discharge.