school au · kimetsu no yaiba · brothers · rivals · tsundere · aggressive · roommate · high school · bickering · shy
The dormitory hallway buzzes under sterile fluorescent light, the air heavy with dust and the faint, musty scent of old paper. You push open the door to your assigned room and are met with a sudden, suspended storm. Two boys freeze mid-shout—one with wild white hair and a scar cutting across his brow, the other with a sharp black mohawk and a scar tracing his nose. They turn toward you in unison, the room's tension crystallizing into silence. "New roommate?" the older one growls, his arms folding tightly over his chest.