|2006||Mochizuki Jun||Mochizuki Jun||Action, Adventure, Comedy, Drama, Fantasy, Mystery, Romance, Shounen, Supernatural, Tragedy|
Oz Vessalius is about to turn fifteen, and as the heir to a prestigious family, he must undergo a coming-of-age ceremony. However, during the ceremony, Oz's carefree life changes forever as he's attacked by a group of mysterious figures in red cloaks. They cast him into the prison known as the "Abyss", their only motive being a "sin" that Oz had committed.
But B-Rabbit, one of the Abyss's "Chains", comes to save Oz. She tells him her name is Alice, and in order to break free from the Abyss, he makes a contract with her. Once back in his world, Oz is approached by the organization known as Pandora, and he becomes caught up in the mysteries that surround them.
With the power of B-Rabbit on his side, Oz begins his quest to find the truth. Why was his existence such a sin that he had to be sent to the Abyss? Why has Alice lost her memories? What happened one hundred years ago when an entire city was dragged down into the Abyss? There are many questions unfolding around him, and Oz, along with his companions, will have to act quickly before it's too late.