Located on the 5th floor, the top floor of the main building, this observation large public bath overlooks the calm flow of the Chikuma River and the beautiful satoyama on the opposite bank. The indoor bath uses elegant two-tone granite, and extending from it is a nostalgic wooden bathhouse filled with atmosphere, where an open-air observation bath unfolds. It is filled with natural hot spring water with a gentle sulfur aroma and a smooth feel, offered as 100% natural free-flowing water, so you can enjoy the famous waters whenever you like, from dusk until the night sky sparkles with stars, throughout the night.

A private open-air bath for staying guests, set on the side opposite the top-floor large public bath. In a space of exquisite stillness where no one will disturb you, you can monopolize 100% natural free-flowing hot spring water while gazing at the wonderful scenery of the Chikuma River basin. The slightly cloudy water is gentle on the skin and slowly eases daily fatigue and chronic stiffness. 45-minute reservation system, fee applies.

These are the superb exclusive open-air baths and indoor baths attached to guest rooms such as the detached tatami-style annex Mimatsutei in the annex building, or the newly established special room Tsukikaze Retreat on the 4th floor of the main building. You can soak whenever you like, for as long as you like, in a famous sulfur-scented bath with 100% natural free-flowing hot spring water, and enjoy a completely private bathing experience 24 hours a day. This luxurious bathing facility meets a wide range of needs, including secluded hot spring therapy stays, families with small children, and universal design rooms accessible to wheelchair users.