The daughter-in-law, Sumire, is under pressure from her mother-in-law to give birth to her grandchild. One day, the whole family decided to go on a hot spring trip. However, his mother-in-law orders him to abstain from sex for a month before the trip in order to make a child. On the day of the trip, Sumire is not satisfied with mechanical SEX with her indifferent husband. On the other hand, the father-in-law also tries to hold his wife, but he refuses. The two who had too much sexual desire headed to the hot springs to calm their bodies. And the father-in-law who happened to witness Sumire's bathing appearance...