A tasteful rock bath in the large public bath filled with natural hot spring water. The natural hot spring water is brought daily from Karuizawa's hidden gem, Kose Onsen, and used after heating and circulation filtration. This mildly alkaline simple spring is silky and smooth, with a very gentle feel on the skin. It warms you deeply to the core, and the warmth lingers even after you leave the bath, making it a famous hot spring that helps melt away full-body fatigue from daytime activities.

A spacious indoor bath installed in the large public bath and enveloped in the rich aroma of cypress. The refined wood-like fragrance rising from the tub and its surroundings fills the bathhouse, creating a forest-bathing effect as if you were in the woods. You can stretch out in the roomy tub and soak at your leisure, fully enjoying a relaxing time.

An open-air bath facing the courtyard with outstanding openness, directly connected to the large public bath. This luxurious space lets you soak while feeling Karuizawa's clear highland air, admiring the beautifully maintained garden by day and the star-filled sky at night. The open-air area is also equipped with two chairs for fresh-air bathing, allowing you to spend an exceptionally relaxing time between the sauna and the hot spring while feeling Karuizawa's cool breeze.

A family bath with advance time reservations that lets you enjoy a luxurious soak in a private space. Like the large public bath, it makes generous use of the gentle natural hot spring water from Kose Onsen. The great appeal is that only your family or couple can leisurely enjoy the famous hot spring without worrying about anyone else. With a design featuring few steps, it offers a comfortable and private hot spring experience even for guests with small children or those who need caregiving support.