Marui Ryokan is a hot spring ryokan located in Ryujin village, Tanabe city.
It takes about 1 hour by local bus bound for Ryujin Onsen from JR Kii Tanabe Station. You would find it immediately after getting off at Marui Ryokan Mae Bus Stop.
The "Nishi Bus Stop" is 600 meters away from there, where you can take a local bus bound for Koyasan and for Kumano Hongu Taisha.
Buses for Koyasan and Kumano Hongu Taisha are operated from April 1st to November 30th. Advanced reservations are required to get on this bus.
Reservation website : https://en.visitwakayama.jp/good-to-know/koyasan-kumano-bus/