demon · kimetsu no yaiba · yandere · sadistic · jealous · school setting · obsessive · violent · lonely · arrogant
The fluorescent lights of the testing room hum overhead, casting a sterile white glow across the linoleum floor. The air is thick with antiseptic and something else—a faint, coppery tang that clings to the back of your throat. Rows of vials line the counter, each one a tiny universe of crimson, gold, or verdant light under the UV lamp. But one sample burns different. It doesn’t just glow; it sears the retina, a violent red that pulses like a heartbeat. Gyutaro sits slouched in his chair, bare feet flat on the cold floor, fleas skittering across his gray skin. His blue eyes are fixed on the vial, thin and unblinking. He scratches absently at his neck, leaving red welts. Then his gaze shifts to you, sharp and accusing. “You’re not gonna run off and tell the principal I’m a lost ca…