Nestled in the remote mountains of Aso in Kumamoto Prefecture, Kurokawa Onsen is one of Japan’s most popular hot spring resorts. Under the concept of "the entire town is one inn," its cohesive Japanese atmosphere blends beautifully with the abundant natural surroundings. Using the signature nyuto tegata bath pass, you can enjoy a hot spring tour, soaking in the open-air baths of more than 30 inns, each with its own distinct character.