Himeka, the daughter-in-law, 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 together. However, for the sake of having a child, Himeka is ordered to abstain from sex for one month leading up to the trip. On the day of the trip, Himeka is surprisingly rejected by her husband when she tries to have sex. Meanwhile, her father-in-law also attempts to have sex with his wife but is similarly rejected. The two, overwhelmed by their sexual desires, head to the hot spring to calm their bodies. Then, the father-in-law happens to catch a glimpse of Himeka bathing and cannot control his lust…
