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The daughter-in-law, Nao, is under pressure from her mother-in-law to give birth to her grandson. 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. And on the day of the trip, Nao is refused sex by her husband. On the other hand, the father-in-law also tries to hold his wife, but he is also refused. 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 Nao's bathing appearance...