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. With her cohabitation as an opportunity, she began full-scale pregnancy, which she had been working on for a long time, but it did not produce results. As a result of taking an examination at her infertility clinic, it turns out that there is a problem with her husband's sperm ... One day, her husband's business trip for 2 nights and 3 days is decided. Akari and Shigeru are alone under the same roof.