No, there isn't. You'll either have to change the ROM, install 3rd party software or do a bit of tinkering:
http://www.aximsite.com/boards/showt...light=japanese
If you do a search with "Japanese" as a search term, you'll find some other threads on your topic:
http://www.aximsite.com/boards/searc...archid=4478674
etc...