Nyaight of the Living Cat

A virus spreads across the world, transforming all humankind into wild, slavering, furry beasts: cats, to be precise. Those few survivors who remain human take refuge in the dark corners of the earth as they fight back against the feline horde. Kunagi, a man with no memory of his past yet a deep knowledge of cats, struggles to hold on with only his wits and a will to survive. Yet the virus transmits merely through cuddles, and Kunagi finds kitties so hard to resist. <em class=de-emphasized>(from manga)</em>

Synopsis from Anime News Network