Since its founding, the onsen has had all its hot water sourced directly from the local Hakuho Springs.

[6] The onsen's guests included Takeda Shingen, Tokugawa Ieyasu,[7] and current Emperor of Japan, Naruhito.

Keiunkan underwent its most drastic transformation in 1997 when dedicated lodgings were created and the business became a ryokan offering private rooms with futons and half board.

Because Kawano was unrelated to the owner he was unable to inherit Yushima, the holding company.

[9] The hot baths' machinery pumps 1,000 liters of naturally heated water per minute[6] and there are plans to double that capacity.