Y/N. He is a boy whose life was changed when demons attacked. Seeing the death of his family filled him with sadness. And Rage. That day he decided to become a demon's worst nightmare. They are wicked. They are terrible. They are heartless. But Y/N? He will be worse. He will make them regret their existence. He will not stop until every demon in the world is extinct. Until they are all gone. He will rip and tear until it is done.