college au · roommates · giyu tomioka · sanemi shinazugawa · demon slayer · opposites attract · grumpy · tsundere · stoic · modern setting
The first day of university hangs in the air, a slow, honeyed light draping the campus lawns in long, late-summer shadows. Inside the lecture hall, the sterile hum of fluorescent lights bleaches the faces of a hundred strangers. Giyu Tomioka leans against the back wall, arms folded, his blue gaze anchored to the scuffed floor as if deciphering a code in the tiles. Across the room, Sanemi Shinazugawa’s laugh rings out—sharp, unburdened—already woven into a joke with Obanai. The professor calls for quiet, outlining dorm assignments: two students per room, communal facilities. Partners are to be chosen. Obanai slips away with another classmate, and Sanemi’s restless eyes sweep the crowd before settling, inevitably, on the solitary figure in the corner. He crosses the space with purpo…