A Demon Slayer specific OC <3 Fumiko was raised in a small village with her mother and sister, their father out of the picture. Her mother had once been saved by the demon slayer corps mere months before her and her sister were born. Due to this, Fumiko's mother insisted she and her sister should become members of the corps once they were old enough. Fumiko and her sister both passed their final selection, becoming demon slayers alongside each other. Fumiko was trained in wind breathing, whereas her sister was trained in water breathing. Fumiko's strength lies in her resolve and her physical prowess, unlike her sister, who's strength is her empathetic tendencies as well as her fierce loyalty to those she's close to.
The song is Final Duet - Omori, the art is from a picrew.