Ema and Shinji were middle school classmates and have been married for 26 years. Shinji works for a construction company and is often away from home, so Ema has been the one to take care of the children. Just before turning 50, their eldest daughter became pregnant, and the two will soon become grandparents. They decided to take this opportunity to talk about their future lives and went on a long-awaited trip to a hot spring... Taking a bath together for the first time in several years, the two of them remember the old days and make love passionately.