The Last Ember (Giyu X OC)

Following the tragic events of the Mugen Train, Kyojuro's elder sister, Kiko, steps up to take his place as Flame Hashira. The shoes she has to fill seem impossibly large. She doesn't know if she will ever be good enough to stand in his place, but a particular Water Hashira flips her world upside down. Together, the face Kiko's inner demons as well as the ones that threaten humanity.

I do not own the cover art.