The daughter-in-law Kokoro is under pressure to give birth to a grandchild. One day, at the suggestion of her mother-in-law, the whole family decided to go on a hot spring trip. However, the mother-in-law ordered him to abstain from sex for a month before the trip in order to have a baby. On the day of the trip, my heart will be rejected by my husband for sex. On the other hand, the father-in-law also tried to hold on to his wife but he refused. The two people with too much sexual desire went to the hot spring to soothe their bodies. The father-in-law accidentally witnessed the heart-stopping bathing scene….