Okinawa Rock climbing9 routes in region
Best climbing in in winter. Summer is too hot and is also the wet season and typhoon season.
Ethic inherited from Japan
There`s not a lot of information about in English on climbing in Japan. Much of the information is kept in personal blogs or is accessed through joining a climbing organization.
Many of the routes are well protected, while other less climbed "sport" routes have loose pitons as protection.
The Japan Free Climbing Association does a lot of good work (http://freeclimb.jp/seibi/seibi.htm) but with some clubs and communities, many techniques and ethics are still passed down from old generations with outdated gear and techniques.
Check out what is happening in Okinawa.