Leading me more and more to believe that the story about the "two monsters" is truly the basis for the twins, and that nina/anna was just as bad as Johan originally and just forgot. Disagree with Xeredge that it's just Johan crossdressing, though that would be a twist. Either Nina's killing everyone associated with kinderheim 511 as vengeance, she's actually been also bad all along, or there's more info to be revealed.