Husband is a serious office worker, and together with his wife, Miho, they have built a happy family life. However, the husband has an irresponsible, pleasure-seeking older brother who constantly visits their home to borrow money before leaving again. One day, this brother suddenly approaches them with an unexpected proposal: to take over a store as his new business venture. As usual, he comes to the couple's home seeking financial help—but this time, things are different. He now needs funding to start his new business, and the couple senses that a major change is about to shake their peaceful life.