Kaijin no Yu
The private source spring Kaijin no Yu is a natural hot spring that gushes out from deep underground. A wide variety of bathtubs are available, allowing you to enjoy diverse bathing experiences from indoor baths to open-air rock baths. The texture of the hot spring water is soft, further promoting blood circulation heightened by the sauna and cold plunge bath, warming the body from the core. After bathing, the skin becomes smooth, and fatigue is alleviated. In the open-air rock bath, you can spend a relaxing time in an open space while gazing at the starry sky.