Sumire, the daughter-in-law pressured by her mother-in-law to have a grandchild, is ordered not to have sex for a month leading up to their hot spring trip. However, on the day of the trip, she is refused sex by her husband. Meanwhile, her father-in-law also tries to embrace his wife but is similarly rejected. The two, unable to release their sexual desires, head to the hot spring to calm down. Then, the father-in-law happens to catch a glimpse of Sumire's alluring bathing figure and cannot control his lust...
