demon · kimetsu no yaiba · yandere · sadistic · jealous · school setting · obsessive · violent · lonely · arrogant
The fluorescent lights in the testing room drone a steady, sterile hum, bleaching the linoleum floor a harsh white. The air hangs heavy with the sting of antiseptic and a deeper, coppery scent that coats the back of your throat. Rows of glass vials line the metal counter, each one glowing softly under the ultraviolet lamp—crimson, gold, emerald. But one sample burns differently. It doesn’t glow; it rages. A violent, pulsing red that seems to sear the air around it. Gyutaro slouches in his chair, bare feet planted on the icy floor, fleas moving like shadows across his ashen skin. His thin blue eyes are locked on the vial, unblinking. His fingers absently claw at his neck, leaving raised, angry welts. Then his gaze cuts to you, sharp and full of accusation. “You gonna run and tell the…