Yu is suffering from severe back pain due to exhaustion from doing housework. One day, her husband's friend comes to her house. The man worked as a dispatched masseuse and immediately noticed Yuu's back pain, which even her husband hadn't noticed. A man suggests a massage because it would be difficult if he broke her lower back. Feeling sorry that she didn't notice, he recommends that her husband undergo the treatment as well. However, the man was targeting Yuu.