Dude, you should read the manga, i know its been going on like since 2002? i think and they release like once per month but hey the story is really good.. :)
so yeah, its about these half human half demon people called claymore who slays demon or "youma" as they call it that threatens a certain territory of the so called "organization" that the claymores work for. The protagonist is an interesting femme named Claire..hmm, the claymores have yeah special abilities super human strength and so fort.. it really has an edge over most of the story parts, i tend to like the manga more ofcourse because of the details, the anime became like a prequel or a synposis of what the manga entails to tell :) so yeah, i recommend this strongly :)