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Sasa-no-yu is a 100% natural “gensen kakenagashi” onsen, which means that the onsen uses pure water as it springs from the earth without adding anything to it and the water that has overflowed will not be reused. As the comfortably warm water of Sasa-no-Yu does not contain many minerals, it is clear and transparent. The outdoor bath is lukewarm. The relaxing bath of Sasa-no–Yu helps make your skin softer and smoother.