Kaneki es un ser mitad Humano mitad Ghoul. Terminó de esta manera por un incidente ocurrido con un Ghoul, del cual recibió los órganos que le salvaron la vida. Se ve de pronto atrapado en un mundo lleno de atrocidades que desconocía totalmente. Kaneki tiene que ocultar su rostro y por lo tanto su identidad de los humanos, lo que lo lleva a usar una máscara, máscaras que todos en el submundo de los Ghouls deben utilizar y cada una de estas máscaras es distinta para cada ser.
Kaneki is a half human being half Ghoul. He ended in this way for an incident that occurred with a Ghoul, from which he received the organs that saved his life. He is suddenly caught in a world full of atrocities that he totally ignored. Kaneki has to hide his face and therefore his identity of humans, which leads him to wear a mask, masks that everyone in the underworld of the Ghouls should use and each of these masks is different for each being.