I'm a what! (KNY Fanfic)

Fe/n 'WAS' a normal girl before she was taken into a world full of man eating demons that lived for a thousand years. Fe/n must lead two girls to make demons and humans coexist with each other while being an eagle. (upper moons are the stronger six of the twelve kizuki, the lower moons are the weaker ones, The weakest of the twelve is lower six while the strongest is upper one.) (Also fun fact the upper moons didn't change over a hundred years but the lower moons constantly change.) (Chapter 10 and on won't have subheadings except for the bonus chapters.) I do not own any of the demon slayer characters other than Silver, Silvery and F/n.