"I think I'm feeling a bit dizzy..." At 40 years old, Naomi visits a hot spring resort with her mom friends, leaving all household worries behind and relaxing in a rare, old-fashioned mixed-gender bath. While chatting casually with a man she met by chance in the bathing area, she suddenly feels lightheaded. As he kindly assists her, his gentle care stirs emotions deep within her. Under the bright light of day, the mixed bath encounter quietly becomes the beginning of an affair...