Here's a quick way to fix the problem that involves editing the fonts themselves rather than the game or executable.
1. Download High-Logic Font Creator which you can download here (
http://www.high-logic.com/download.html) (30-day trial version, unrestricted).
2. Open the font you want to edit (e.g. Times New Roman, but I recommend using a free font and not a commercial one).
3. Click Format, Settings, select the Ranges tab, then click Edit... in the Code Page Character Ranges section and uncheck all the checkboxes while checking JIS/Japan (932), then click OK, then click OK again.
4. Click Format, Naming, click Windows Unicode BMP (UCS-2) and change the names in the Naming sections where applicable, then click OK.
5. Then click File, Save As..., then name the file whatever you like (e.g. newfont.ttf) and click Save.
Then just install that into your Windows fonts section and it should show up in the KiriKiri2 engine for any game.
Some fonts might look ugly, so it might take you a few tries to see which fonts look good.
~ArchDemon