The Otsuki couple is a mandarin duck couple who have been married for 40 years. After her son became independent and her husband retired, they spent the rest of their lives together. One day, her son gave her a hot spring trip to celebrate her 40th wedding anniversary. Come to think of it, we never went on a trip together since our son was born. At some point, the couple became sexless, and rather than a man and a woman, they became partners who shared joys and sorrows. On a hot spring trip that is different from everyday life, the two are reunited.
