Kokoro, the wife, is under pressure to give birth to her grandchild. One day, at the suggestion of her mother-in-law, her whole family decided to go on a trip to a hot spring. 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, her husband unexpectedly refuses to have sex with her. Meanwhile, her father-in-law also tries to hold his wife, but is refused. The two, who are full of sexual desire, are in agony.