>So it is Japanese-only?
yes, especially for cute/professional part of it it must be Japanese (maybe ハーフ girls in general, and foreign girls in gravure and JAV can be exceptions?)

It's a harder to say for amateur ero. If she is visibly east asian (no black titz or very bone-y facial structure etc), there is no speaking, and hawt in your judgement, I think should be fine for everyone's eye candies and faps - I had to look up a bit to see https://xcancel.com/fsmuggler5 posted there isn't Japanese. Still, feel free to remove all surely non-Japanese content you find, if u want to spend your time on it