Responses
Probably connected to her father? Also worth mentioning there's not a single mention of angels or holy things when demons and angels in other works usually exist in the same realm
I assumed it was just supposed to represent math, lol
She hates the number 6 LOL, this is clearly some foreshadowing. For the reason why she doesn't show her wings maybe? Just a guess tho, since this manga loves foreshadowing.