Okunoyu

Okunoyu is a hot-spring ryokan in Kurokawa Onsen, the onsen village in Minamioguni, Kumamoto Prefecture. The property pairs an outdoor thermal bath with guest rooms, and it welcomes both day-trippers and people staying the night.

The outdoor bath draws on the geothermal water that gives the village its reputation, with open-air pools set against the surrounding hillside. Access works two ways: a day pass lets visitors use the baths without booking a room, while overnight guests get the same thermal pool as part of their stay.

Hours run the same every day of the week, 8:30am to 8:30pm, which gives a wide window for a soak whether someone is passing through Kurokawa Onsen for an afternoon or settling in for the night. Staff speak English, useful for sorting out bath rules or logistics on arrival.

Specifics on day-pass pricing, towel rental, or room rates for overnight stays aren't listed here, so it's worth calling ahead or checking the official website before planning a visit.