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Tsumugi, a wife, is under pressure from her mother-in-law to give birth to a grandchild. One day, the whole family decided to go on a trip to a hot spring. However, in order to have a baby, her mother-in-law orders her to abstain for a month before the trip. On the day of the trip, Tsumugi's husband refuses to have sex with her. Meanwhile, his father-in-law also tries to hold his wife, but he is also refused. The two, overcome with sexual desire, headed to a hot spring to soothe their aching bodies. Then, by chance, her father-in-law witnessed Tsugi taking a bath and couldn't control his desire...