Im not sure if this is the name or not. i just saw this mini-movie on adult swin, and this is the freakiest anime i've evr seen...

It starts out when some kids here about a rumor of how kids are dissapearing in a dark town, in a game of hide and seek. Every1 has to wear fox masks for some reason, and what happens is, some kid whos the winner of hide and seek is it, and he turns into a demons and tries to capture thousands of kids who come to play this game of hide and seek, and they kill them, to use them as a light source for the city. And lasts momentarily.. This is crazy, you ahve to see it.... Well, my little rant is done. any1 else seen it??