Three years have passed since her husband died in an accident. Satsuki, who lives with her son Kenichi, receives a marriage proposal from a man. Kenichi readily agrees to her remarriage, and Satsuki is excited about her new life, but... Soon after remarrying, Satsuki feels sorry for her husband's stepchild, Ryota, who is being treated badly by her husband. While Satsuki is sympathetic to Ryota, who has become a new family member even though they are not related by blood, she ends up letting him play with her body. Kenichi finds out about it...