In the city Istanbul, originate a peculiar form of monsters. Ghouls, they're called; roaming around the city, yet remaining invisible to the citizens. All except those who hunt them: the Exorcists. When Ahmet Hamdi is discovered by an exorcist, Yahya Kemal, he finds himself in a university. As a new world opens for Ahmet, he has to learn to navigate his power and the responsibility that comes with it. But as he learns to become an exorcist, he will unfold unwanted secrets, as well.