In manga chapter 8 and anime episode 10, Castor told Frau: "If the higher-ups learn about this (letting Teito keep memories of having seen Frau's true form), you'll be stripped of the right to be a Ghost."

I have been puzzled by this for a long time, Was Castor referring to humans, the higher-ups in the Barsburg military, or some mysterious heavenly higher-ups who have not been shown?

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