Sayumi, a wife who lives a mediocre daily life with her husband and three sons who are college students. One day, she accidentally sees her son without locking her toilet. She didn't mind it at all, but her son then started thinking of her mother as a woman... And on a hot summer night, she can't stand the sight of her mother spending her lightly dressed, and finally her son pushes her mother down and rapes her. Since then, an unusual relationship between her mother and her son began….
