With his first paycheck, Takeru, the only son, gives his mother Chisato a two-day, one-night trip as a gift. The inn only has mixed bathing, so the two decide to bathe together to protect Chisato from the other guests. However, this decision becomes a catalyst for change in the relationship between the Shoda family. The mother sees her late husband in her son, and the son secretly adores his mother as a woman. But is that really such a bad thing? It's fine to have a lifelong partner within your family, and it's fine for them to be parent and child. It's a happy, happy thing...