A stadium-style sauna that fuses Finnish smoke sauna elements with Japanese aesthetics. The interior is wrapped in jet-black walls finished with a blend of Nara sumi and shibu-sumi, creating a unique sense of solemnity and weight not found elsewhere. The sauna stones are original Kikuma-tile stones called Onimaru and Onidama, developed jointly with the long-established Koizumi Seigawara kiln in Kikuma Town, Imabari, now in its tenth generation. At :00 and :30 each hour, one of the industry's largest blowers activates the Fuujin Heat Wave, instantly transforming the room into an intensely hot space with automatic löyly. The sauna also supports self-löyly, and regular aufguss events are held by staff.

A small Finnish-style sauna hut set in the open-air area. It is equipped with a custom stove engineered to maximize löyly by optimizing sauna stone size, evaporation speed, and heat source. Its signature feature is the tea löyly using green tea from Shingu Village: when hot sauna stones are doused with the green tea, steam rich in catechins spreads, offering a relaxation wrapped in the aroma of tea.

The main sauna in the women's bathing area. In addition to an auto-löyly at :30 each hour, the Fuujin Heat Wave (automatic löyly) runs at :00 and :30 every hour between 7:00 and 23:00. The far-infrared heater provides gentle heat that warms the body from deep within, and the humidity rises sharply after automatic löyly to promote sweating. During aufguss events, staff also deliver heat waves to guests.

A women-only steam sauna filled with Ehime's nature and craft. A very high-humidity mist of 80–100% mimics the Hijikawa arashi, the morning mist that flows down the Hijikawa River, and moisturizes the skin. The exterior is styled after Keshima, an outlying island of Imabari, and the roof displays a Setoka citrus tree. Surrounded by delicate Tobe-yaki patterns and accompanied by soundscapes of mikan groves, the sauna experience evokes the depth of Ehime culture.