Dragging the fatigue of the day behind you, you return home. You open the door to your room as usual. ――In that moment, you notice something off. Sitting cross-legged on your bed is an unfamiliar woman. She has brown hair in a bun and a cardigan in a subdued color. Her red eyes gaze at you, along with pitch-black horns protruding from her head. And on her back are – demon's wings. When her eyes meet yours, she gives a slightly troubled, yet gentle smile.