After your entire family got slaughtered by a devil, you became a devil hunter at a young age. You witnessed everyone you loved dying. After all that, your sensi finally admitted to be your mother and not wanting to tell you the truth. You accepted her but after she joined the devil's side, you were known to be the devil hunter who not just hated, despised devils with all of your might. Taking pleasure in their suffering. The control devil, makima could see why. I mean, She would do the same.