Shiho Terashima, a Takara Eizo exclusive! Shiho, who is 41 years old and has been married for 12 years, was feeling anxious that she couldn't get pregnant. Her relationship with her husband was good, and she was having sex in accordance with her ovulation days. However, she couldn't get pregnant. One day, Shiho learns that her father-in-law has six children. When she heard that story, Shiho comes up with a forbidden act. She knew it was wrong to think about it logically... But Shiho, who desperately wants a child, ends up asking her father-in-law for sperm donation. Moreover, that was... a way of providing sperm that couldn't be thought of in common sense. The father-in-law, who wants an heir, decided to respond to Shiho's outrageous request in a businesslike manner. Even if she tells herself it's just a business matter, the overflowing pleasure. Shiho and her father-in-law desperately resisting that pleasure. And the decision they made in the end is...