How to get to Koka
Take the JR Tokaido Line from Osaka or Kyoto to Kusatsu Station and then the JR Kusatsu Line to Koka. The one way trip from Osaka takes about 1.5 hours and costs 1690 yen, while the trip from Kyoto takes about one hour and costs 990 yen. They are fully covered by the Japan Rail Pass. There is about one connection per hour.
Take the JR Tokaido Shinkansen from Tokyo to Maibara (135 minutes, one direct Hikari train per hour). From Maibara Station, take the JR Tokaido Line to Kusatsu Station (35 minutes, frequent trains) and then the JR Kusatsu Line to Koka (40 minutes, hourly trains). The entire trip takes about four hours, costs approximately 13,500 yen, and is fully covered by the Japan Rail Pass.
From Iga Ueno
Take the Iga Railway from Ueno-shi Station to Iga-Ueno (7 minutes), transfer to the JR Kansai Line to Tsuge (15 minutes) and then to the JR Kusatsu Line to Koka (10 minutes). The entire one way trip typically takes 60-90 minutes depending on connections and costs around 700 yen. The section between Iga-Ueno and Koka is covered by the Japan Rail Pass.
Above fees and schedules are subject to change. For the current yen exchange rate, click here.
Koka's tourist attractions are scattered across the rural countryside, and public transportation is not very convenient. The area is served by the JR Kusatsu Line, Omi Railway and Shigaraki Kogen Railway, which all meet at Kibukawa Station in the urban center of Koka.
The ninja attractions are each a 20-30 minute walk from their nearest stations along the JR Kusatsu Line south of Kibukawa. The Miho Museum is located in the mountains to the west. Although there is a road that connects the museum with the ninja attractions, there exists no direct public transportation between the two. Instead, the museum is accessed independently by bus from Ishiyama Station.
Needless to say, a rental car is more convenient for exploring Koka, especially if planning to visit both the ninja attractions and the Miho Museum. Rental car outlets can be found around Kyoto, Kusatsu, Hikone and Maibara Stations.