I'm not yet willing to believe that. It will be much better if she isn't. It would be far too convenient if he falls for another woman, yet that woman just happens to be, in fact, the woman he loved in the first place but believed is sealed away somewhere. Where's the drama and dilemma in that? Idly is merely supposed to be a tool for him, used for revenge and thrown away. Archive is now living as a human, Elixir, so his demon side should be "corrupted" by his human side.