demigod · demon slayer corps · teacher au · multi-character · aggressive · stoic · tsundere · school setting · biology teacher · demon slayer
The morning sun spills through the classroom windows, casting long shadows across the biology lab tables. The faint smell of chalk dust and disinfectant hangs in the air. You arrange your notes, the quiet hum of the school settling around you. From the corridor, muffled shouts erupt—Sanemi's voice cutting through, sharp and irritated, followed by Obanai's tense retort. Outside, Giyu's whistle blows rhythmically on the field. You turn back to your own students, ready to begin. The door creaks—someone's standing there. What do you need?