Abundantly using lava stones mined from Mount Iwate as sauna stones, the "iki Heater" by METOS heats a large capacity of stones. Self-löyly is possible, and when water is poured over the lava stones, powerful steam rises instantly, enveloping the body in soft and profound heat. After the sauna, you can also enjoy an outdoor air bath while admiring the beautiful streams of Iwate.

A space reminiscent of a cave nestled behind rock walls, characterized by a wild atmosphere with natural rock surfaces looming. Finnish-style self-löyly is possible, and when water is poured over the stones, the steam reflects off the rock walls, creating a unique heat convection. Adjacent to the two-story open "Hidaka-no-Yu" large bath, after the sauna, you can enjoy bathing in various tubs such as the hinoki cypress bath, stream-viewing semi-open-air bath, and ceramic bath. Embraced by streams and rock surfaces, a "totonou" experience awaits, uniting with nature.

A cold plunge bath to moderately cool the body heated in the lava sauna. The temperature is moderately cold, allowing for a thorough soak. After receiving the profound heat of the lava sauna, tighten your body and head to the outdoor air bath area overlooking the stream, where deep relaxation awaits with the murmuring of the Toyosawa River.

A cold plunge bath to moderately cool the body temperature elevated in the cave sauna. The temperature is suitably cold, allowing for a leisurely soak. After receiving the unique heat of the cave sauna, tighten your body and savor the lingering relaxation in the stream-viewing semi-open-air bath area or rest space.