Nero is a member of the Order of the Sword.He got his arm দ্বারা being attacked and knocked out.When he wakes up his arm is in a sleage.What he doesn't know is that he has a demon arm.So Nero leaves from the hospital and fights আরো demons on his way back.He then goes back to the Order of the Sword and as আপনি know meets Dante as he hops in on the leaders speech.As Dante and Nero fight, he discovers his arm.What he doesn't know that he is an Angel/Demon.He figures it out when Credo tells him that he is and অ্যাঞ্জেল and Dante tells him he is a Devil.For the record Nero is not a Dante wannabe,he just has a resemblence to him,if that case Leon Belmont from Castlevania Lament of Innocence is a Nero wannabe.That is all fact and no opinion.You can say I'm wrong অথবা আপনি can say I'm right,doesn't matter because I know what I am.