Oka is Kitsune that had been around for many years and has already gained her ninth tail. She is more powerful than any demon slayer could imagine almost on par with Muzan Kibutsuji. Along her journey of gaining all her tails she took in four lesser demons and transformed them into more powerful demons who she raises as her younger siblings. How will Tanjiro and his trio react to the discovery to a demon so close to god living not that far from demon slayer headquarters?