<p>It's been a few months since my beautiful son's daughter-in-law, Akari, started living with my father-in-law, Shigeru's house. Taking advantage of the cohabitation, I started trying to get pregnant, which I had been working on for a long time, but I didn't get much results. As a result of taking an examination at the infertility clinic, it turns out that there is a problem with the husband's sperm ... One day, the husband's business trip for 2 nights and 3 days is decided. Akari and Shigeru are alone under the same roof.</p>