Ichino Yu Onsen - A Tattoo-Friendly Hot Spring in Kinosaki Onsen, Hyogo

The facade stops you first. A sweeping Momoyama-style entrance modeled after a kabuki theater, all dark wood and curved roof, planted at the center of Kinosaki's canal-lined main street. Then you step inside and descend into the cave bath — a grotto carved from natural rock, dimly lit, with warm salt-tinged water pooling in stone basins while cool air drifts in from above. This is the bath that gave Ichinoyu its name: "Number One," after an Edo-period physician declared it the finest spring in the country.

Ichinoyu is one of seven public sotoyu in Kinosaki Onsen, a hot spring town built around the ritual of walking between bathhouses in yukata and wooden geta. Most visitors treat it as part of that circuit — stepping from the willow-lined streets into the cave, soaking until the salt water softens their skin, then moving on to the next bathhouse down the canal. Tattooed guests bathe here without covers or questions, part of Kinosaki's town-wide open-door approach to its sotoyu.

If you want the single most distinctive bath on the Kinosaki circuit — the one people photograph from outside and talk about after — this is it.

• The Cave Bath: A grotto carved from natural rock with low ambient light — the most unusual soak on Kinosaki's seven-bathhouse circuit, and the one most visitors remember.
• Tattoos Accepted Across All Seven Sotoyu: Kinosaki's public bathhouses operate under a town-wide tattoo-friendly approach — no covers, no patches, no questions at any of the seven.
• Kabuki Theater Architecture: The Momoyama-style facade is the most photographed building on the main street — a landmark you'll spot before you find the entrance.
• Salt Spring Water: The mineral-rich water leaves a faint salt trace on your skin and runs hotter in the indoor baths, cooler in the cave — two distinct soaking temperatures in one facility.

The salt hits your lips before you notice the temperature. The indoor bath runs hot — enough to make you ease in slowly — with jet streams along one wall that work out the tension from a day of walking Kinosaki's cobblestone streets. The water is clear with a faint mineral weight, and your skin feels distinctly smoother after twenty minutes.

Then the cave. You duck through a low passage into a rock-walled grotto where the light drops and the sound changes — water echoing off stone, conversation fading to murmurs. The water here runs cooler than inside, comfortable enough to stay longer. The rock overhead closes in just enough to feel sheltered without feeling tight. At night, soft lighting transforms the space. Most bathers alternate between the two — hot indoor, cool cave, repeat — and lose track of how many rounds they've done.