Kibutsuji Sisters

....well this is my own stupid idea only 3 days before my birthday....soo other info: muzan had 4 daughters who he CREATED in his lab...he hid 3 of them in a hidden places...and the youngest (that's you) was kidnapped and raised by tomayo and muzan's other 3 daughters are still in the hidden...muzan also has a son named kaizen who is the youngest.... story: only a few weeks before the final battle muzan found you...after the battle when everyone was focused on tanjiro muzan slipped you a small round semi-flattened crystal and said take care and also told you to find your sisters...then kaizen become a demon slayer (he is a human+his mom was also a kidnapped demon slayer) extra: the 1st daughter is hanako kibutsuji...2nd daughter is masumi kibutsuji...3rd is naomi kibutsuji...and 4th (you) is akira kibutsuji...all sisters are demons from birth and were born without a female involvement(don't ask me why)