Nao, the wife, is under pressure from her mother-in-law to give birth to a grandchild. One day, her whole 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. And on the day of her trip, Nao's husband refuses to have sex with her. Meanwhile, her father-in-law also tries to embrace his wife, but is also refused. The two of them are in agony because they have too much sexual desire.