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A hot spring deep in the mountains. At this ryokan, which offers a private open-air bath for rent, couples who have been on a trip and have gotten carried away are having a rut thinking that no one is watching them. Why did the owner of this ryokan create such a cool thing as a private open-air bath? To see on them as they engage in erotic acts! Someone is getting fucked, fucked, fucked in this hot spring today!