​A hot spring that flows directly from the source, located in the headwaters of the Shimanto River, the last clear stream in Japan.

Spring quality: Fluorine metaborate (bicarbonate cold mineral spring).
The building is surrounded by nature and has an open-air bath, whirlpool bath, jacuzzi, sauna, and medicated bath.
Effective as a recuperation spring for "neuralgia, chronic gynecological disease, muscle pain, arthralgia, frozen shoulder, bruises, wrinkles, chronic digestive diseases, hemorrhoids, poor circulation, fatigue recovery, cuts, burns, chronic dermatitis", etc.