The waters here are volcanic, rising along the banks of the Kuzuryū River in Fukui Prefecture, and they have been doing so for a very long time. Records trace the spring back to 1690, the Genroku era, when the feudal lord Matsudaira Tadamasa came to bathe. That a daimyō once soaked in these same mineral waters tells you something — not about grandeur, but about the kind of quiet confidence a place accumulates when it has served a single, steady purpose for over three centuries. Daianji Onsen was a tōjiba, a place for healing stays, and something of that original character still lingers in the air.

What remains today is modest in scale. Banshōkaku, an inn in the Shijūdani-chō area, continues to operate, offering the simple proposition of hot water and a place to sleep. A public facility called Sukatto Land Kuzuryū opened in 1994 but was marked for closure in 2021, a small episode in the broader story of contraction that has shaped so many onsen districts since the late twentieth century. There is also a hospital that draws from the original source — a detail that speaks to the therapeutic reputation these waters once commanded, and to some degree still do. The layers here are not picturesque; they are the ordinary accumulation of use, decline, and partial renewal.

To stay for several nights at a place like this is to settle into a rhythm that has little to do with sightseeing. Twenty minutes by bus or taxi from Fukui Station, the onsen sits close enough to a city to feel connected, yet the presence of the Kuzuryū and the embankment lend it a sense of remove. You would wake, bathe, perhaps walk along the river, bathe again. The volcanic minerals would begin to feel familiar on your skin. And gradually, the history of the place — Genroku-era bathers, Meiji-period prosperity, postwar reinvention — would become not a story you had read, but something almost felt in the weight of the water itself.