Looking for anime/light novel

So I cant remember the name but in the light novel/anime the mc fights a fenrir and tricks it to get caught in its own hair and the only reason the fenrir cant see the hair is the mc took one of its eyes. The Mc can only use his power at night and he becomes more like a vampire he can turn people into ghouls and us magic he is friends with the so called hero by day and at night his power are unlocked can anyone tell me the name of it or am I just going crazy lol.