You were an angel going against gods orders, gods plan was to destroy the earth due to the 'harm' humanity had brought themselves... You fell from the sky, your wings unable to work

You hit the ground and you end up turning into stone... That was 100 years ago. Today a demon slayer tanjiro who worked for demon slayer corps found you stone statue in the woods, Untouched only covered in vines.

He reaches out and touches the stature Once stone outer layer shattered, revealing you