Claymore

I've been reading the manga and watching the anime, both of which are very well done. Normally I'll read a manga series and then watch the anime and complain about how much better the manga was compared to the anime but not this time.
Storyline: The Yoma, being shapeshifters, are capable of taking on human form and living in disguise amongst humans. By consuming a human's brain, Yoma can also absorb their memories, allowing them to disguise themselves as specific people without alerting any of their close friends or family. A nameless and highly secretive organization has created an order of superhuman warriors to protect humans from the Yoma. These warriors have come to be popularly known as Claymores, after the immense claymores they wield. Villages being attacked by Yoma hire Claymores to kill the Yoma for a large fee. The plot follows Clare as she fights Yoma and struggles to hold on to her humanity. As the series progresses, she becomes a stronger and better fighter, gradually earning the respect of strong allies and coming in conflict with the shadowy organization, the top Claymores who support them, and many powerful "Awakened".