The seven springs that make up Ichinoseki Onsen did not arrive all at once. Sukayu and Mayu were already old when the newer wells were drilled in the late Showa and early Heisei years, and the grouping itself was only given a common name in 1990. That layering — ancient sulfurous water beside recently tapped sources — gives the place an unusual texture, as if several different eras of longing for the bath had settled into the same mountain valley and learned, gradually, to coexist.

From Ichinoseki Station, National Route 342 leads west into the hills toward the border with Akita Prefecture. The gorge at Genbikei shapes the middle of the journey, and inns such as Keisenkaku — drawing from two distinct bicarbonate springs — sit close enough to its waters that the sound of the river becomes part of the stay. Further along, Sukayu Kogen Onsen rises near the prefectural boundary, its sulfur-rich water belonging to the older tradition of extended, restorative bathing. Between them, the Mayu Onsen Center along the roadside offers sodium-calcium sulfate water to those passing through without ceremony.

To spend several nights here is to fall into a quiet rhythm that the valley seems to encourage. No single bath defines the experience; rather, it is the accumulation — the shift from one water chemistry to another, the drive deeper into the hills, the growing sense that the landscape and its springs have been in quiet conversation for a very long time.