Yuzu, who lost her parents, lives with her sister and brother-in-law. One day, her sister asks her, 'Since I have difficulty getting pregnant, could you please bear my husband's child instead?' After much struggle, Yuzu decides to make a baby with her brother-in-law for her sister's sake. However, betraying the sisters' feelings, her brother-in-law becomes engrossed in having sex with Yuzu and ejaculating inside her. Gradually, changes begin to occur in Yuzu's heart...
