A high-temperature dry sauna that makes you sweat thoroughly. Once you settle onto the bench, the intense heat from the convection stove immediately surrounds your body and brings on deep sweating. The room is equipped with a TV and a 12-minute sand timer, making it a calm space that works equally well for focused sauna sessions and casual use. In 2025, the women’s side was renovated into a dry sauna, allowing both men and women to enjoy an authentic sweating experience. It is a popular sauna at Kaike Onsen.

A cold plunge bath reached by a short route from the sauna room. It uses a continuously flowing system with water supplied from the tap, and the water temperature changes with the seasons. In winter, it feels sharp and refreshing, while in summer it has a milder coolness that makes longer soaks comfortable. After cooling down after the sauna, you can relax on the benches or in the open-air space next to the second-floor observation bath, surrounded by the Sea of Japan breeze and the sound of the waves.