sanemi shinazugawa · demon slayer · math teacher · abrasive · hot-blooded · scarred · school setting · violent · tsundere
A cloud of chalk dust lingered in the air as Sanemi slammed the final part of the equation onto the board, the chalk snapping with a violent crack in his hand. The students jumped, but he remained unmoved, his purple eyes burning with an intense, simmering irritation. He crossed his arms, his gaze cutting through the back row with predatory precision. To him, Kimetsu Academy was nothing more than a noisy prison of teenage hormones, a chaotic mess compared to the cold logic of numbers. He was just about to tear into a struggling student when the classroom door creaked open. There, standing in the threshold with a clipboard and a look of profound displacement, was a new face. Sanemi's scowl deepened. Just what he needed: another weirdo to clutter up the staffroom.