After losing his wife, Takao has been living with his son and daughter-in-law for the past six months. Though he maintains a seemingly good relationship with his daughter-in-law, Rinko, he struggles with growing sexual desires as he ages, pushing him to the brink of endurance. When Rinko suffers from chronic lower back pain, Takao offers to help, drawing on his past experience as a massage therapist. Initially cautious and concerned, his hands gradually begin stimulating Rinko's most sensitive areas. Hidden emotions seep through the cracks of daily life, giving rise to an unexpected and intimate relationship.