A full-fledged dry sauna located in the indoor bath area of the Tensei main bath, filled with the rich aroma of wood. The mild, comfortable heat warms you gradually from the core without feeling stifling, helping you sweat in a healthy way. Using it between rounds through the spacious bath areas enhances circulation even further, adding a refreshing touch to an open and liberating bathing experience.

A calm dry sauna attached to the basement Iwaburo, which is lavishly covered with the natural monument Sanba Stone. Designed to harmonize with the solemn, tranquil atmosphere unique to the rock bath, this space lets you quietly close your eyes and face yourself while fully enjoying deep sweating in strong heat. Its chic sauna room feels like a hidden retreat for adults, making it easy to reset your everyday fatigue from deep within.

A refreshing cold plunge bath placed right next to the dry sauna. It uses rich underground water from the Haruna mountain range, and the water feels astonishingly smooth and gentle on the skin. It quickly cools down your heated body after the sauna and envelops you in a pure, clean sense of freshness. This clean and inviting cold plunge bath is ideal for alternating hot and cold bathing, connecting you to the rest area and the open-air zone.

A compact cold plunge bath quietly installed beside the sauna in the basement Iwaburo. It also uses clear natural water from Haruna, and its smooth quality feels pleasant against the skin. Because it has no chlorine-like harshness, you can bathe calmly and comfortably in a tranquil underground space facing the rock walls, quietly sinking in up to your shoulders and enjoying a superb hot-and-cold contrast bath as your body's rhythm gradually settles.