Oku no Yu Ryokan Onsen (奥の湯)

Category: Onsen

Entrance: 500円
Tubs: Some indoor, outdoor, and 2 outdoor mixed baths.

"Nice ryokan, which is a little isolated by can still be reached by foot from the center of the town. Its baths are located just next to a river, in quiet surroundings. Apart from the segragated inside baths - which are not very appealing - there is a large mixed outdoor bath, a small one located just next to the river and a small cave bath."

source: Secret Onsen

Kurokawa Area Official Onsen and Ryokan Website (japanese)