Motomura Touko struggles with ongoing personal frustrations that leave her feeling unfulfilled despite her commitments at home. Discovering that the women in her family share a peculiar hereditary condition, she resolves to investigate its origins. Her path leads her back to her childhood village, where a legendary hot spring is believed to offer clarity and solutions. As she arrives and begins her inquiries, the peaceful surroundings start to reveal layers of hidden family history and local lore.