"Lukewarm source bath" used as free-flowing water with neither heating nor added water, at the spring's original temperature. The source is fossil seawater estimated to be about 120 million years old, making it an exceptionally luxurious famous spring containing radon. Its ideal lukewarm temperature is pleasantly cool without being cold, so you can soak for a long time, gently stimulating the parasympathetic nervous system and leading both mind and body into a deeply relaxed state.

A strong saline hot spring that rises from 1,700 m below the surface of the deep sea. It combines the characteristics of a chloride spring and a sulfate spring, and its mineral concentration is about 26 times the standard level, earning it the name "the bath of double moisturizing and heat retention." Guests can fully enjoy luxurious bathing in a variety of tubs, including the open, spacious indoor bath in the large public bath, the open-air bath where you can feel the sea breeze with all five senses, and the reclining bath where you can stretch out and relax.