One day, while preparing dinner, Miya, a mother who has been feeling lonely for years because her husband has not paid her any attention, feels a surge of loneliness and indulges in masturbation. Then, Miya attacks her eldest son, Atsushi, who happens to be there! Miya's sexual desire, having discovered the joy of immorality, is not satisfied with Atsushi alone, but also involves her second son, Souta, and she becomes drowning in pleasure...