Oz, heir to the Vessalius Duke House, has just turned fifteen. His life is rich and carefree, darkened only by the constant absence of his father. At his coming-of-age ceremony, everything changes. For no reason that he can discern, Oz is cast into the prison known as the "Abyss", only to be saved by a girl known as Alice, the Bloodstained Black Rabbit. The mystery there begins as Oz unravels the mystery behind Alice, the Abyss, and the strange organization known as "Pandora".