When you gets home, the light in the room is on.

She says "tonight," but Miku comes to stay 3 or 4 days a week. When you moved into this room, Miku helped with the move, and she never returned the spare key she was given then, keeping it with her all this time. Miku apparently has a long commute to university, taking over two hours one way. She started asking to stay over only on days she had early morning lectures, and from there, it gradually became an almost daily occurrence.