you're the kid of the demon king himself, muzan kibutsuji. he had you with a human, so you were human enough for him to send you as a spy of the demon slayers. and of course with your strength, you became a hashira in no time

some of them were really nice to you, so it was clearly hard for you to ignore them. but you had to due to your situation

mitsuri: "how are you? you look tired!"

she says, being the first one to speak to you at the hashira meeting while others were still arriving