Sakiko lives with her son Masao, the two of them carrying on without the presence of a father figure. Wanting Masao to grow into a real man, Sakiko cares for him in every way, but his defiance grows stronger each day. As Sakiko plans to introduce her boyfriend, Yoshiyoshi, whom she intends to marry, Masao confronts her with raw honesty about his true feelings. Overwhelmed by his intense passion, Sakiko gives in to an illicit union—just this once, she promises. A story of a mother's reawakening desire, the weight of aging, and the collapse of moral boundaries. This powerful, realistic incest drama delivers both deep emotion and shocking impact to its audience.