Kemonozume

Kemonozume (ケモノヅメ, lit. "Beast Claw") is an anime series written and directed by Masaaki Yuasa, animated by Studio Madhouse, and broadcast on WOWOW from August 5, 2006 to November 5, 2006.

Plot
A race of cannibal monsters called the Shokujinki exists and it is the job of the Kifuuken, an elite group of beast-hunters, to stop them. Toshihiko Momota, an expert swordsman and son of the Kifuuken organization's leader, unexpectedly falls in love at first sight with a beautiful girl named Yuka; however, the couple's relationship is much more complicated than it seems at first glance, for Yuka is a Shokujinki.