I'm going Kiyoshigekan on Dec but don't knoe how to go fr Tokyo to Kusatsu Onsen, anybody can help
I recommend you to use a direct bus from Shinjuku. The direct bus is JR highway bus. The one way trip costs 3,300yen, and takes about 4 hours.
The JR highway bus arrives to Kusatsu Onsen Bus Terminal. From the bus terminal to Kusatsu Onsen Kiyoshigekan, please use taxi. Is costs about 800yen, and takes 5 minutes.
Get an answer from Kiyoshigekan staff and past guests.