Oz Bezarius, heir to one of the duke houses, has just turned fifteen. His life is rich and carefree, darkened only by the constant absence of his ther. At his coming-of-age ceremony, however, everything changes. For no reason that he can discern, hes cast into the prison known as the Abyss, only to be saved by a chain known as Alice, the bloodstained black rabbit. It is unknown why was he cast into Abyss, how does Alice ctor into it all, and what does the organization known as Pandora want with him.
(Summaries provided by ANN and AniDB)