Support for Japanese characters

Hi,

I'm a japanese who was trying to use Zoho Invoice for a while, but in vain. Unfortunately, the PDF export function doesn't seem to support Japanese characters: they show up blank where expected.
It's really too bad since the rest of the features (ie. settings and custom templates) seem to accept Japanese characters.

Is there any future plan to support Japanese? or any trick to get rid of the problem?

Cheers,