[Machine Translation] Kaoru's older sister, Kaoru, is on a mission to go out with her younger brother, Kusata, on the orders of the department head. They go to a hotel together for a rock bath, which they could not go to together when they were children, and while relaxing with only a towel on... Kusata's important part changes... This is the 8th volume of the sexy comedy that takes place at a school in the northern country!