After Chisato carried out a surrogate pregnancy for her daughter and several years passed, her relationship with her son-in-law naturally ended, and she returned to living alone. Just then, her younger sister and brother-in-law appeared before Chisato with grave expressions. They asked Chisato to act as their surrogate, just as she had done for her older sister. Though Chisato felt her world go dark, she couldn't bear to see an innocent sad face and had no choice but to agree. After that, her daughter listened to her mother Chisato's menstrual cycle and investigated the days suitable for conception. The three of them waited tensely in the bedroom, with her daughter watching over them as Chisato and her brother-in-law began their act. Though Chisato told herself she shouldn't feel anything, she still felt numb as she engaged with the young man again. She received his sperm inside her while feeling her own sexual desire boiling up. The conception was successful, and her sister and brother-in-law had a healthy baby. As Chisato gazed at the child, her eyes were fixed on her brother-in-law...
