Every room has its own private onsen bath (some add an open-air one too) with simple sulfur spring water; the source runs too hot to use neat, so it is cooled with added water rather than free-flowing
And the bath? It's in your room. Not down a corridor, not on a sign-up sheet. Run it before dinner. Run it again at midnight. Wake up and get straight back in — nobody's timetable touches you here.
Private-bath and water facts were checked against the property's official site and Japanese booking pages in November 2026. Room plans change — confirm the private bath is included in the plan you book.
More in Kurokawa
Every room has its own indoor and open-air baths with free-flowing spring water, and the hilltop Tenku open-air bath can be reserved privately — free, 40 minutes at a time
Three private family baths — two open-air, one indoors — free for up to an hour, key from the front desk. Sources disagree on whether the water is fully free-flowing, so we make no claim either way
Each of the five detached villas has its own natural hot-spring bathroom and private sauna, usable around the clock. The official page mentions free-flowing spring water only in passing, so we don't promise it