At the request of her older sister Yoshiko, who is unable to have children, Ayu, the younger sister, is pressured into having a relationship with her stepbrother and becoming a surrogate pregnancy. The rebellious younger sister Ayu refuses to have sex with her stepbrother due to a physiological aversion, but one night a few months later, she finally makes up her mind and they make love. Yoshiko's attitude becomes more prickly every time they have sex, and the relationship between the three of them becomes more uneasy... Her brother-in-law's demands gradually become more perverted, and Ayu awakens to pleasure as he plays with her body. The second installment of the "surrogate pregnancy" drama that depicts the twisted love-hate relationship between sisters and their stepbrother!