The main large bath area consists of the 9th-floor indoor bath, the Observation Large Bath EZOFUJI, and the rooftop Sky Open-Air Bath TENQOO on the top floor. The infinity-style open-air bath, where the hot spring and the lake seem to become one, offers an overwhelming sense of openness, and on clear days you can see Nakajima and Mt. Yotei. Inside, a variety of baths such as reclining baths, standing baths, and seasonal baths are arranged in a refined design using polished granite, while the soft sodium-calcium chloride hot spring water warms the body from within and helps retain heat.

A unique large bath that meticulously recreates a public bathhouse from the good old Showa era. Tile-lined tubs, a dynamic mural of Ezo Fuji, yellow Kerorin buckets, retro weighing scales, and other nostalgic touches are scattered throughout the space. There are two bathtubs: one with plain hot water and the other with sodium-calcium chloride hot spring water, allowing guests to relax and enjoy high-quality water in a playful atmosphere.

A completely reservation-based private spa located on the top floor of the spa resort building. Through the large windows, you can enjoy the panoramic views of Lake Tōya and the towering Mt. Yotei all to yourself, without any interruption. It is filled with high-quality sodium-calcium chloride hot spring water, making it ideal for families or couples to enjoy a luxurious, private moment together. Admire the natural beauty of Tōya as it changes with the passing hours, and indulge in an exquisite private spa experience.

A dedicated observation hot spring bath in the guest rooms with hot spring baths in the premium wing, Nonokaze Club. Even while staying in your room, you can look out over the beautiful panoramic view of Lake Tōya through the window and enjoy the smooth sodium-calcium chloride hot spring water exclusively whenever you like, 24 hours a day. In complete privacy, you can immerse yourself at length in Tōya's nature and hot springs in silence, creating the ultimate luxury stay with superb dining and an exceptional bathing experience.