Mahiro, the wife, is under pressure from her mother-in-law to have a grandchild. One day, the family decides to go on a hot spring trip. However, for the sake of conceiving, her mother-in-law orders her to abstain from sex for a month leading up to the trip. On the day of the trip, Mahiro is shockingly denied sex by her husband. Meanwhile, her father-in-law also tries to get intimate with his wife, but is also rejected. Frustrated by their pent-up desires, the two head to the hot springs hoping to soothe their restless bodies. However, the father-in-law accidentally catches a glimpse of Mahiro bathing and, unable to contain his lust... .
