Tokyo Ghoul (Vol. 1) by Sui Ishida

Ghouls live among us, the same as normal people in every way?except their craving for human flesh. Ken Kaneki is an ordinary college student until a vio-lent encounter turns him into the first half-human half-ghoul hybrid. Trapped between two worlds, he must survive Ghoul turf wars, learn more about Ghoul society and master his new powers. Shy Ken Kaneki is thrilled to go on a date with the beautiful Rize. But it turns out that she?s only interested in his body?eating it, that is. When a morally questionable rescue transforms him into the first half-human half-Ghoul hybrid, Ken is drawn into the dark and violent world of Ghouls, which exists alongside our own.