After 26 years of marriage, Ema and Shinji, who first bonded as middle school classmates, continue to cherish their relationship. Shinji works at a construction company and has spent years on mandatory solo work assignments, leaving Ema to handle nearly all aspects of raising their children. This year, their eldest daughter became pregnant, meaning the couple will become grandparents next year. At this pivotal moment, they take a long-overdue hot spring trip together, just the two of them. Seeking to reconnect, they share a bath together for the first time in years. As they reminisce about the past, they passionately make love. Soaking in the warm waters, they deepen their bond as husband and wife, leaving a heartfelt impression of enduring love and intimacy.