Tsumugi, who is pressured by her mother-in-law about when she will give birth to a grandchild. One day, the family decided to go on a hot spring trip together. However, for the sake of having a child, she was ordered to abstain from sex for a month leading up to the trip. Then, on the day of the trip, Tsumugi was refused sex by her husband. Meanwhile, her father-in-law also tried to have sex with his wife but was refused as well. The two, unable to vent their sexual desires, went to the hot spring to calm their bodies. Then, the father-in-law happened to catch a glimpse of Tsumugi bathing and couldn't hold back his desire…
