here's an idea, most likely been done before.the apartment isn't her own, personaly i would say it's somewhere that someone recently left without a trace. i would say that she was led by friends who thought i would be funny to lock her in they laugh as madosuki tries to get out and pretend to leave as they are leaving they turn back but get sent out of the apartment for making to much noise and breaking in and said person locks up the apartment.and a few hours of hunger later the game beingswhen it ends she kills herself because she can't take the pain of starvation no longer and she knows she'll die anyways.toriningen, friendly looking characters that put you into somewhere unexcapeable.