Donationware as said above is a good idea. I think you would need an english section of your site though so people can make donations. Maybe a section at the top that asks which language you speak like Oriol Gomez. If you hear nothing or letter letter letter, just go down one until you hear english or something like that, then you get the english section of the site. That way you could sort of run parallel english and Japanese donations to the same paypal.
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