Yuzu has lost her parents and lives with her older sister and her husband.One day, her older sister asks her to give birth to her husband's child in place of her who is having difficulty conceiving children.After her conflict, Yuzu decides to make a child with her brother-in-law for her sister's wishes.However, her brother-in-law is immersed in vaginal cum shot sex with Yuzu so as to betray her sister's feelings.And gradually a change is born in Yuzu's heart.