The son goes on a business trip, while the father-in-law and daughter-in-law secretly engage in incest.

It's been a few months since Akari, my beautiful daughter-in-law, moved in with my father-in-law, Shigeru. Taking advantage of the trial living arrangement, I started trying to get pregnant, something I had been working on for a long time with little success. A check-up at a fertility clinic revealed that her husband had sperm issues. One day, her husband was scheduled for a business trip for 2 nights and 3 days. Akari and Shigeru were alone under the same roof.