Description
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An anime adaptation produced by Xebec began airing on April 2, 2009, and finished airing on September 24, 2009. On February 11, 2010, NIS America announced it would release the anime series in North America. Nine OVAs were also broadcast in Japan, airing from July 24, 2009 to March 25, 2010.Oz is the heir to the Vessalius house, one of the Four Great Dukedoms given excessive power by the country's royalty. He lives a luxurious life alongside his younger sister Ada and valet and best friend Gilbert. This extravagant lifestyle is only diminished by the constant absence of Oz's father Xai, who decided Oz and Ada should be raised by their uncle Oscar when they were still babies. When Oz goes to his Coming-of-Age Ceremony, he meets Sharon Rainsworth and her ominous servant Xerxes Break. Everything appears normal until the Coming-of-Age Ceremony rituals are completed and the giant clock that hasn't worked in a century moves. Suddenly, a group of people in red cloaks known as the Baskervilles proceed to reveal themselves. The Baskervilles say he must be dragged into a supernatural prison called Abyss where monsters called Chains live, a place previously believed to have only existed in fairy tales. The Baskervilles then force Oz into the Abyss, claiming his existence to be a sin, although Oz is clueless as to the true meaning behind these words and the desire to acquire it becomes a driving force for the rest of the series.

Trapped in the Abyss, Oz finds out he can make contracts with Chains by drinking their blood. He does so with a Chain named Alice, infamously known as the Bloody Black Rabbit (or B-Rabbit for short), in order to escape the prison. By the time they escape from the Abyss, ten years have already passed. He is taken under the care of Sharon and Break, who he discovers are members of a Chain-research organization called Pandora that was established a century ago after a disaster known as the Tragedy of Sablier (in which the entire city of Sablier fell into