Tokyo Marble Chocolate

Tokyo is under attack from a hideous threat: flesh-eating "ghouls" who look like people and mix in with the local populace. Ken Kaneki, a reserved college student, hides his head in his books and stays away from the news of the escalating catastrophe. Rize Kamishiro, a gorgeous woman, walks up to him and politely asks him out on a date, breaking his seclusion. Kaneki realizes she isn't as kind as she first seemed and that she has been deceiving him while accompanying Rize home. He later awakens in a hospital after a devastating battle and learns that his life was saved by having the now-deceased Rize's organs transplanted into his own body. Kaneki changes into a human-ghoul hybrid as his body starts to mutate in horrible ways. Kaneki holds onto his humanity as he sets out on his new terrifying quest amid the developing brutal war between society's new monsters and the government agents who seek them.