Shiro no Keiyaku

A white crow named Shiro is frequently targeted by other crows due to his rare coloration. After being severely injured by a group of them, he is rescued by a girl whose kindness impresses him. Inspired by her compassion, Shiro makes a pact with a devil to transform into a human. The agreement requires him to perform at least one harmful act each day, or else he will disintegrate. Shiro must now navigate this difficult condition while trying to live among humans.