The daughter-in-law, re-no, is pressured by her mother-in-law about when she will give birth to a grandchild. One day, the family decides to go on a hot spring trip. However, for the sake of having a child, she is ordered to abstain from sex for a month leading up to the trip. On the day of the trip, her husband surprisingly refuses to have sex with her. Meanwhile, her father-in-law also tries to make love to his wife but is refused as well. The two, unable to release their sexual desires, head to the hot spring to calm down. Then, the father-in-law accidentally sees re-no bathing and cannot hold back his desire…
