Kyoko, a married woman, is devoted to caring for her husband's father, Yasuo, every day. One day, after Yasuo quietly says, "I'd like to go to a hot spring before I die," the family decides to take a trip together. Upon arriving at the inn, Kyoko's husband, Kensuke, receives an urgent call from work and is forced to return immediately, leaving Kyoko alone with Yasuo. Removed from their daily routine, the two find themselves drawn into a new and unexpected relationship. The quiet atmosphere of the hot spring town deeply stirs their emotions. The burden of caregiving begins to spark unfamiliar feelings between them. Amid warmth, loneliness, and forbidden desire, how will the bond between them transform?