Wickian

Tom Boden; widely known as Tobias,hunts those called Wickians, magical people who are said to be the children of Demons. He has vowed to destroy each and every magic user, because to him, they are the very essence of evil, even if they seem like kind people. This is because his parents were murdered by them when he was little, and his twin sister kidnapped. And then he meets Magic, who calls herself Mag to seem less conspicuous. She is the most powerful Wickian he has ever come across, and she doesn't even seem to realize she's even a Wickian. When he tries to kill her, he is left shocked when he is unable to do so, and he takes the girl with him, trying to figure out who she is and what she means. Little does he know, Mag is the only one capable of destroying magic once and for all. But she is also capable of destroying the whole world.