Or, if you are working with Windows, you can use
Microsoft's AppLocale. Once you have the East Asia characters installed, you can have Microsoft simulate different locals without having to reset your main local. All you do is run the AppLocale program and tell it to run under the last item on their list (Japanese), and the program works just fine. However if you are running on a 64-bit processor, then you might get a few odd moments (meaning you may have to save a bit more often). The game is definetly designed more for 32-bit processors, but other than that, the AppLocale program works just fine for me. Plus you can have AppLocale to create a shortcut so that you don't have to go through AppLocale every time you want to use the AppLocale, for the program. It will bypass all of the wizardry stuff and go almost straight into the game (you will have to confirm about using the program, but that is just and extra "Yes"). I'm decently far into my first game, (Age 16), but it does take quite a while before you can get far, it's taken me almost 8-10 hours on this one game so far.