His wife Rio is under pressure to give birth to her grandchild. One day, at her father-in-law's suggestion, she and her family decided to go on a hot spring trip. However, in order to have a baby, her mother-in-law orders her to abstain for a month before her trip. On the day of her trip, Rio's husband refuses to have sex with her. Meanwhile, her father-in-law also tries to hold his wife, but is refused. Two people who are full of sexual desire, their bodies are in agony.