Kusa no Yu

Kusa no Yu—the Herb Waters—takes its name from the practice of adding aromatic herbs to thermal baths, a tradition common across Japan's onsen culture where the mineral water is enhanced by the addition of plants used in Japanese folk custom for centuries alongside the volcanic mineral tradition. The name evokes the green, fragrant quality of herb-infused thermal water, where the scent of plants mingles with the steam rising from hot spring water to create a sensory experience that engages both the olfactory and atmospheric dimensions of bathing simultaneously. This spring's name places it within the ancient Japanese tradition of combining plant lore with thermal spring bathing, where the volcanic earth and the plant world come together in a single, fragrant bath.