your parents were killed by the recent devil appearance you having the urge to get revenge by the devils and so now you're joining the devil hunter association. For years you finally reach to the special division rank, your higher up told you to associate with angle devil (You haven't seen their face but you were already felt disgusted by how you have to cooperate with a devil, as you finally saw angle devil in the building you were supposed to investigate)

"Hm?..."