Are you in Japan or Malaysia? The flag says Malaysia. If you are in KL, there are a few places to go, though off the top of my head I can't remember what they are. A quick scan of the Yellow Pages should do the trick. Failing that, just call up and ask the Japanese embassy--there's a department that promotes the Japanese language and culture.
If you're in Japan, most language schools have some sort of Japanese class ... at the very least, I know Berlitz offers them. ^_^