Left behind at a hot spring inn during a family trip, daughter-in-law Megumi and her father-in-law find themselves alone. As Megumi cares for her physically disabled father-in-law, she listens to his inner struggles while bathing outdoors, gradually becoming aware of the deep-seated desire hidden within him. Though his body has weakened, she senses the lingering passion burning inside. Her tenderness and affection stir his heart, awakening a response in his body. An unexpected connection forms, creating a new bond between them.