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Himeka, a daughter-in-law, is pressured by her mother-in-law to give birth to a grandchild. One day, the whole family decides to go on a trip to a hot spring. However, her mother-in-law orders her to abstain from sex for one month until the trip in order to conceive. On the day of the trip, Himeka is refused sex by her husband. Meanwhile, her father-in-law tries to embrace his wife, but is also refused. The two, with their sexual desires at their disposal, head to a hot spring to calm their bodies. Then, by chance, the father-in-law witnesses Himeka bathing and can't suppress his desire...