Claymore Vol. 1: Silver-eyed Slayer (Claymore #1)
Author: Norihiro Yagi
Desc: A Claymore - a female warrior named for the sword she carries - travels from medieval village to village to destroy Yoma monsters who disguise themselves as humans and who are almost impossible to kill. Claymores are half-humans half-demons who willingly transformed themselves by mixing their blood with monster's blood. Claire nicknamed silver-eyed killer is such a powerful Claymore she can slay a Yoma using only one hand. But she must constantly struggle to keep from becoming a monster herself.