If you're using Windows, this is a built in feature. Just google how to change your system locale.
The reason this is necessary is because the game has Japanese unicode written into it's coding. If your computer has no unicode records for Japanese characters, the game won't work.
If you have successfully changed your system locale, and you still have a white screen, it's more likely a different software issue. Such as outdated drivers or packages. I always suggest to start with updating your graphics driver, DirectX, vcredist, or even Microsoft.NET framework.