Mao, a high school girl, is asked to perform a surrogate pregnancy by her older sister who is unable to have children.Mao decides to have sex with her brother-in-law because her sister wants a child with her blood.Mao, whose young body is played with by her brother-in-law, gradually begins to feel pleasure from her.On a night when her sister is away on a trip, her stepbrother unleashes her perverted sexual desires.Mao is tied to a chair in a room littered with obscene SM goods.Mao is forced to drink an aphrodisiac and is raped in a threesome with her brother-in-law's friend...The fourth incest drama about a ``surrogate pregnancy'' where family love and sexual desire intertwine! !