Oz Bezarius, heir to one of the duke families, is fifteen years old. His life is affluent and happy, only marred by his father's persistent absence. Everything changes at his coming-of-age ceremony, though. For no apparent cause, he is hurled into the "Abyss," only to be rescued by a "chain" known as Alice, the bloodstained black rabbit. It is unknown why he was cast into the Abyss, how Alice fits into this, and what the group known as "Pandora" wants with him.