Tokyo Ghoul (東京喰種) is a Japanese manga series by Sui Ishida. It was serialized in Shueisha’s seinen manga magazine Weekly Young Jump between September 2011 and September 2014 and has been collected in fourteen tankōbon volumes as of August 2014.
Tokyo Ghoul is set in an alternate reality where ghouls, individuals who can only survive by eating human flesh, live among the normal humans in secret, hiding their true nature to evade pursuit from the authorities. Including enhanced speed, senses, and regenerative ability, a regular ghoul is several times stronger than a normal human, has a skin resistant to ordinary piercing weapons and have at least one special predatory organ called a “Kagune”, which they can manifest and use as a weapon during combat. Another distinctive trait of a ghoul is that when they are excited the color of their sclera of both eyes turn black and their irises red, or in only one eye of these eyes undergoes the transformation, in the case of a half-ghoul. A half-ghoul can either be born naturally as a ghoul and a human’s offspring, or artificially created by transplanting some ghoul organs into a human. In both cases, a half-ghoul is usually much stronger than a pure-blood ghoul. To hunt down the ghouls, several government-sponsored organizations around the world were created