A spacious large bath built entirely from Aomori hiba cypress. The moment you step inside, the refreshing scent of hiba cypress gently tickles your nose and envelops you in deep relaxation. Hyakuzawa Onsen, known locally as the "hot spring of heat," is served as luxurious free-flowing spring water with no heating or added water. The water contains chlorides and bicarbonates, and is characterized by a smooth, supple texture that seems to cling to the skin. It warms you from the core and gently melts away the fatigue of everyday life amid the quiet of abundant nature.

A nature-rich open-air bath made of natural rock, fully taking advantage of the surrounding landscape. The same luxurious Hyakuzawa Onsen spring water flows freely here as in the large bath, allowing you to fully enjoy your bath while feeling the fresh air of nature on your skin. The surrounding oak virgin forest changes beautifully with the seasons, from fresh greenery to fiery autumn leaves and winter snowscapes, offering a truly special moment as you soak and gaze at a view as beautiful as a painting.

A private open-air bath with free-flowing spring water, available in some guest rooms. A low-temperature spring-water faucet is also installed so you can adjust the temperature to your liking. In a private space reserved just for you, you can luxuriate in the fresh waters of Hyakuzawa Onsen anytime you want. Uninterrupted by anyone, you can quietly soak while feeling the clear air at the foot of Mt. Iwaki and the gentle passage of time with your own skin.