Case 1: A new employee girl goes on a trip to a hot spring in Tohoku with a senior colleague from work and two other girls. As they let loose and have fun at the hot spring, some local men come in. It turns out it's a mixed-gender hot spring that local girls don't go to. Case 2: Some men pick up girls on a hot spring trip. They do whatever they want to the girl in the mixed-gender hot spring and insert their thick dicks raw. Case 3: They pick up a girl who is traveling alone at a hot spring resort. They go into the mixed-gender hot spring together and insert their dicks raw.