Aimi, drenched in sweat, gets entangled with her ex-boyfriend Okuda. She tells her ex about her summer vacation plans to reconcile with her husband and go to a ryokan in Kusatsu. One day, she meets her husband's younger brother Tsuyoshi, who says he wants to come along, leaving Aimi confused but eventually agreeing. However, at the ryokan, Tsuyoshi starts to forcefully pursue her…
