Where is Vampire Knight set? It seems plausible that Vampire Knight could be set in Japan, but I'm wondering if there is any more specific or concrete than that given either in canon or by one of the authors. If it is set on earth, where are the vampires from, because most of them are blond and blue-eyed, which would imply that they aren't from Japan.

Is there any evidence of whether Vampire Knight is set in Japan, or even on Earth?
I'm not sure how reliable is this source but according to TvTropes, 


  It's easy to miss the fact that the series is set in the far future, after the apocalypse, long enough after for things to have been rebuilt to about the same level. In a recent flashback, Juri tells a story of her adolescence to the young Yuuki; we've heard before that she was about three thousand years old, and the architecture and setting appears to be roughly modern day Japan, certainly within the last 30 years or so.


But I think the setting where Vampire Knight is set most likely fictional.