Flower Flame Hashira (Kimetsu No Yaiba/Demon Slayer)

She was a Hashira with demon blood but no one knows it. She's been living for 800 years and stay hidden in the flowery mountain. Will she show herself up and help the current generation of hashira?

P/S : I might borrow some characters in Genshin and change their original role from the suitable role in my story, I hope you don't mind :)

Cover cr : Pinterest