There are two distinctly wonderful bathing experiences at this onsen: The amber-colored water in the Golden Hot Spring is iodine-rich and naturally maintains a temperature of one hundred degrees, while the inky water of the Tokyo Black Hot Spring feels almost gelatinous and gets its color from the skin-clearing minerals. There’s also a gorgeous hot stone sauna and a small selection of food in the lobby. For the complete experience, order the onsen tamago, an egg cooked in the hot spring water, which you eat with a cup of diluted apple cider vinegar.

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