Mr. and Mrs. Yuki have been married for 27 years. His wife, Rei, works at a beauty salon, and her husband, Yoji, is busy as a financial bureaucrat, but the couple has worked together to raise their two children. Yoji has five years left until retirement. Meanwhile, the eldest daughter, who got married as a student, had a child. He is the long-awaited first grandchild. Taking this opportunity, the two of them went on a hot spring trip for the first time in a long time to discuss their future lives slowly. On a hot spring trip for the first time in a long time, the middle-aged couple burned hotly.