Masato, the stepchild of her father-in-law, who is the remarriage partner of her mother who is currently working alone, and Waka, who lives with her three mothers. - Masato and Waka, whose blood is not connected, eventually began to have a physical relationship, and secretly kept a secret relationship so as not to get caught, but her relatives uncle saw that relationship. .. - And her uncle who was lustful for her young body was forced to stop SEX.