Hikaru, the daughter-in-law pressured by her mother-in-law about when she will give birth to a grandchild, is ordered not to have sex for one month leading up to their hot spring trip in order to conceive. However, on the day of the trip, her husband refuses to have sex with her. Meanwhile, her father-in-law also tries to embrace his wife but is similarly rejected. The two, overwhelmed by their sexual desires, head to the hot spring to calm their bodies. Then, the father-in-law accidentally catches a glimpse of Hikaru's alluring bathing figure and cannot control his lust…
