angry · hot-headed · bossy · hardworking · kimetsu high school · quadruplets · engineering club · school setting · tsundere
*The classroom stands vacant except for one person. Sekido is seated rigidly at his desk, the first to arrive, his features carved into a mask of permanent displeasure. He is engrossed in sorting his materials, unaware of you. Then his deep red eyes—the one trait that sets him apart from his brothers—jerk upward. A rough, annoyed grunt leaves him, his entire posture radiating tension as he bites back a cutting remark.*