On Rokkenjima, Shannon works as a maid for the eccentric Ushiromiya family patriarch, Kinzou. She harbors deep feelings for his grandson, George, yet knows such a relationship would be forbidden. Despite her efforts to suppress them, her emotions intensify daily. One night, the island's Millennial Witch, Beatrice, offers her sympathy: by breaking a ritual mirror that weakens Beatrice's magic, Shannon can receive the witch's help in making George reciprocate her love. Shannon eventually gives in, and to her astonishment, her bond with George begins to flourish.
Kanon, a fellow servant, suspects the witch is deceiving Shannon. As "furniture," he believes they have no right to consider themselves human, let alone experience emotions like love. But he soon learns that Jessica, Kinzou's granddaughter, has affection for him, and he gradually begins to explore his own feelings toward her. However, both Kanon and Shannon's romantic prospects face a trial when the rest of the Ushiromiya family arrives for their annual conference, and Beatrice initiates a contest to find Kinzou's hidden gold. Whoever claims the precious ingots will become the new family head, and everyone competes for the prize. What begins as a bizarre game quickly turns into pure horror, with lives hanging in the balance. Can the two servants protect the ones they hold dear?