Awakening in Room 431 of a labyrinthine, ever-expanding mansion, a young girl named Alice finds herself trapped in a surreal and nightmarish library. The rules of this bizarre estate are simple yet cruel: once the mansion expands to 666 rooms, a grand "party" will commence, sealing the fate of its guests for eternity. Determined to avoid this doom, Alice embarks on a perilous descent toward Room 000, the only supposed exit.

However, the mansion violently opposes her escape. A punishing physiological toll plagues her journey: the further Alice travels from her designated room, the more her physical body begins to rot, horrifyingly transforming her flesh and bone into letters and text.

As she navigates the maddening architecture, Alice encounters the twisted residents of the other rooms. From a self-righteous judge and a desperate aspiring musician to fictional entities completely unaware of their own artificiality, each being represents a different form of psychological entrapment and despair.