The air of celebration surrounding fifteen-year-old Oz Vessalius’s coming-of-age ceremony quickly turns to horror when he is condemned for a sin about which he knows nothing. He is thrown into an eternal prison known as the Abyss, from which there is no escape. There, he meets a young girl named Alice, who is not what she seems. Now that the relentless cogs of fate have begun to turn, will they lead only to crushing despair for Oz, or is there some shred of hope for him to grasp on to? 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.