A large facility renowned for its abundant natural hot spring water bubbling up from 2,000 meters underground. The spacious sauna rooms feature regular auto-löyly sessions, creating an environment that satisfies everyone from beginners to seasoned sauna lovers. The cold plunge bath uses nano water, which is gentle on the skin and has a notably soft feel. Open 24 hours, it also accommodates late-night and early-morning visits, and offers excellent post-bath relaxation facilities such as a relaxation lounge and a manga corner.