Breath of The Pheonix (KnY) Tanjiro x Reader

(Credits to all the artists) :)

Her whole world gone, crumbled right before her eyes.Everything she knew and loved vanished.

At the age of 15 Y/N swore to herself and her family that she would avenge them and bring justice upon them.

Y/N set her heart to kill the one demon that caused her misery and pain.Kabitsuji Muzan
Y/N stumbling across a swordsmen with a very uniqe breath style. The breath of the Pheonix. But beware this breath is not as pretty as it sounds. Pheonix breath is both life and death, only 5 swordsmen have been able to master this breath.... what made it so uniqe and dangerous ??

upon that fateful day Y/N was once a younge girl with a stong spirit , beautiful,smart,caring,selfless,strong etc
But now nothing but black remains , shes filled with hate,despair,rage such nasty feelings and emotions.

But what if she crosses paths with a younge man with a keen sence of smell and his younger sister. Will this outcome be for better or worse