I watched a fairly decent movie the other week which in reviews said it was loosely biased on anime, now I can not remember the name of it when a co-worker was asking how it went.
The girl had ended up being a 1/2 demon but her entire reason for being kept alive was to work for the US services in the 40's or so, hunting down demons. She did not find out till the end who her main enemy was (not saying more as it would spoil it) - any clues?