Recommendations For Anime/manga Like...?

I was wondering if anyone had any recommendations for anime/manga that are similar to D.Gray-Man, Karneval, Black Butler or Pandora Hearts? Something involving an organisation fighting something that the public know very little about and has a darker side to it such as the animes and mangas mentioned above. If someone could recommend perhaps an ongoing manga at least or completed anime that has both similar stories and artwork as the ones mentioned above it would be great. Thanks in advance

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