Miyō, the daughter-in-law pressured to give birth to a grandchild, wins a hot spring trip at a local shopping street lottery. The family decides to go together. However, this trip was planned by her mother-in-law as a baby-making trip. On the day of the trip, Miyō tries to seduce her husband into having sex as ordered by her mother-in-law but is rejected. Meanwhile, her father-in-law also attempts to have his wife but is turned down. The two, unable to vent their sexual desires, head to the hot spring to calm their restless bodies. Then, the father-in-law happens to catch a glimpse of Miyō bathing…
