Tokyo Ghoul

Tokyo Ghoul (東京喰種トーキョーグール) is a Japanese manga series written by Sui Ishida. It's sequel series is titled Tokyo Ghoul:re.

Plot
Lurking within the shadows of Tokyo are frightening beings known as "ghouls," who satisfy their hunger by feeding on humans once night falls. An organization known as the Commission of Counter Ghoul (CCG) has been established in response to the constant attacks on citizens and as a means of purging these creatures. However, the problem lies in identifying ghouls as they disguise themselves as humans, living amongst the masses so that hunting prey will be easier. Ken Kaneki, an unsuspecting university freshman, finds himself caught in a world between humans and ghouls when his date turns out to be a ghoul after his flesh.

Barely surviving this encounter after being taken to a hospital, he discovers that he has turned into a half-ghoul as a result of the surgery he received. Unable to satisfy his intense craving for human meat through conventional means, Kaneki is taken in by friendly ghouls who run a coffee shop in order to help him with his transition. As he begins what he thinks will be a peaceful new life, little does he know that he is about to find himself at the center of a war between his new comrades and the forces of the CCG, and that his new existence has caught the attention of ghouls all over Tokyo.