Lio, burdened by the pressure to have a grandchild, is sent on a family hot spring trip at her father-in-law's suggestion. However, for the month leading up to the trip, she is ordered to abstain from sex by her mother-in-law for the sake of conception. On the day of the trip, Lio is shockingly rejected by her husband. Meanwhile, her father-in-law also tries and fails to have sex with his wife. The two, overwhelmed by their pent-up sexual desires, head to the hot spring to calm their bodies. Then, the father-in-law happens to catch a glimpse of Lio bathing…
