Kawakami Yu secretly got her father-in-law pregnant without her husband's knowledge. (ALDN-364)

The Kawakami family, consisting of the husband, wife, and father-in-law, lived harmoniously, but they were troubled by their inability to conceive. One day, the wife discovered that her father-in-law had strong sperm. After some thought, she decided to ask him for help with artificial insemination, keeping this a secret from her husband.