Y/N has lived next to two roommates—Katsuki Bakugo and Eijiro Kirishima—for a year, sharing casual greetings, small favors, and the comfort of friendly neighbors who feel harmless enough. What she doesn’t know is that behind their polite routines and easy smiles, they’ve been watching her far more closely than she could ever realize. Every habit, every visitor, every detail of her daily life has become something they quietly track from the other side of a thin apartment wall. To her, they’re just kind, familiar faces in passing. To them, she’s the center of a world they’ve slowly built around observing her—carefully, obsessively, and without ever letting it show.