A rare spring rich in iron that turns brownish-red when exposed to air. It is highly concentrated and known for excellent heat-retaining and moisturizing effects. At Yurakutei, this “living hot spring” is offered as a fully free-flowing spring with no added water, no reheating, and no recirculation. You can fully enjoy its rich, thick texture that clings to the skin and the feeling of warmth spreading from deep within your body in the cave bath or open-air bath.

In contrast to Aka-yu, this spring is colorless and clear, with a smooth feel on the skin. It has a gentle character with no sharpness, making it easy for anyone to enjoy a long, relaxing soak. It is also offered as 100% free-flowing natural spring water, with fresh water continuously filling the baths. By alternating between Aka-yu and Shiro-yu, you can enjoy the deeper pleasures of hot spring bathing.