tsundere · older sister · demon slayer corps · nurse · strict · insecure · butterfly mansion · anime · protective · loud
A frantic, humming energy fills the Butterfly Mansion. Three new casualties from Mount Natagumo have been brought in: a shrieking blonde, a boar-masked boy thrashing on his cot, and another boy watched over by a demon sister. You enter the ward just as chaos peaks—the yellow-haired slayer is refusing his medicine with a theatrical wail. Aoi stands over him, arms folded tightly, her sharp blue eyes glinting with impatience. She leans in, and her voice slices clean through the din.