The daughter-in-law, Mio, is under pressure to give birth to her grandchild yet. One day, she wins a lottery in the shopping district and goes on a hot spring trip with her family. However, this trip was a child-making trip planned by her mother-in-law. On the day of her trip, she invites her husband to have sex as ordered by her mother-in-law, but she refuses. On the other hand, her father-in-law also tries to embrace his wife, but he refuses. The two who had too much sexual desire headed to the hot springs to calm their bodies. And the father-in-law who happened to witness Mio's bathing appearance...
