A sodium bicarbonate spring that gushes from within the grounds, and is extremely rare in the Boso region. The weakly alkaline brownish water is known as a beauty bath, and its smooth, slightly viscous texture is one of its defining features. The weakly alkaline quality gently softens dead skin cells, leaving your skin astonishingly smooth after bathing while warming you thoroughly all the way to your core. The public bath, Chobo Senri no Yu, located on the 3rd floor, alternates between men and women.

A luxurious private open-air bath with both an indoor bath and an open-air bath in a single room. Like the public bath, it draws in the inn's own sodium bicarbonate spring, known as a beauty bath. In this private space, you can relax and enjoy a refined hot spring experience while feeling the sea breeze, without worrying about your surroundings.

An open-air hot spring bath available in some guest rooms. It draws in the sodium bicarbonate spring that gushes from within the grounds, allowing you to enjoy the hot spring at any time right from your room. It offers the luxury of a private hot spring stay, where you can immerse yourself in the smooth, viscous water while feeling the sea breeze.