Yuu suffers from severe back pain due to fatigue from housework. One day, her husband's friend comes over to the house. The man is a contracted masseuse, and he immediately notices Yuu's back pain, which her husband hadn't noticed. The man suggests that she get a massage, saying that it would be terrible if she hurt her back. Feeling guilty for not noticing, her husband also encourages her to get a treatment. However, the man has his sights set on Yuu. Yuu is touched in a sensitive place, and her pleasure is heightened, so she is swept away by the man's touch...