@KHM_01 Well i think even Amu chan ( Azz kun's mom) also knows that he is human, in earlier chapter after harvest festival when iruma was going to tell his secret to his friends Amu chan stopped him. I think she could read mind or whatever and knows about iruma from early on.
Comment by Arsenal on KHM_01
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@Arsenal That is most likely true and considering her son and Iruma's relationship she may keep it a secret and protect Iruma-kun like seen in the chapter