Mio is under constant pressure to produce a grandchild. When the family wins a hot-spring getaway in a shopping-district raffle, they all travel together—but the trip is secretly her mother-in-law's plan to make the couple conceive. Mio invites her husband to have sex as instructed, only to be rejected. Her father-in-law is likewise turned down by his wife. Both left painfully aroused, Mio and her father-in-law head to the baths to calm themselves, where he happens to see her bathing...