If anyone is interested in Rock climbing in Japan.
There is a place called Ogawayama and the locals say its the best in Japan.
"Yosemite of Japan"
Here is a good link - http://www.ogawayama.com/
I went out the the area in the rainy season which was not the best idea but still was really worth it.
We trained to Matsumoto from Osaka. (not sure if this is the best place to get a car) Then drove to Ogawayama which takes about 2 hours.
Hired a car form: http://rent.toyota.co.jp/en/index.html
There website at present is not in english but call them and you can talk in english. ph: 0800 7000 815 (really easy)
Good article here- http://www.ukclimbing.com/articles/page.php?id=264
Helpful map - http://www.ogawayama.com/others/Og_Access.jpg
Enjoy! about 10 years ago