Access and Map.
It is an hour's walk from the nearest station. And even if you get on the bus, it is a 40 minute walk from the nearest bus stop.
So I recommend only using a taxi.
10 minutes by taxi from Hankyu Nishiyama Tennouzan Station.
15 minutes by taxi from Hankyu Nagaoka Tenjin Station or JR Nagaoka kyo Satation.