The text display just fine of it's own but like for
any japanese webpage, you have to change the character
set to "japanese" into your web browser. Else, it won't
know that there is japanese in the page.
(To make the browser change automaticaly, you can send
the character set into the header of the webpage. Not
realy doable for the forum as most people don't have
a japanese font installed)

Cheers,
Yann Stettler