Sumire, the daughter-in-law, was under pressure from her mother-in-law to give birth to a grandchild for her. One day, the whole family decided to go on a hot spring trip. However, her mother-in-law ordered him to abstain from sex for a month before the trip in order to have a child. On the day of the trip, Sumire was not satisfied with the mechanical SEX with her indifferent husband. On the other hand, her father-in-law also tried to persuade his wife but he refused. The two, who had too much sexual desire, went to the hot spring to soothe their bodies. And the father-in-law happened to witness Sumire bathing.