Wish you best of luck in your search but 1st only Allah know the future for your son just because you like Japanese culture etc... It doesn't mean that son will too! Don't be so picky when it comes marriage trust Allah not the website. 1st of not all Japanese people are all that! That how it seems when you watch tv but in reality they are human being just like us. And it fact they have high suicide rate!
Every single person on face of the earth was born with beautiful culture I am pretty sure they are a lot beautiful muslim pious girls around you Remember what our beloved prophet Mohammad said about the marriage and fallow his guidance
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