Just when it seems the tragedy of Sablier is on the verge of recurring at Isla Yura's residence, the sinister blade of the Headhunter swings once more. From the darkness where the mysteries of Fianna's House and Humpty Dumpty converge, one truth will come to light: an unmoving reality that is itself so shocking, it seems like an illusion...Will Oz and his allies ever recover?

As the tragedy of Sablier unfolds anew at Isla Yura's mansion, the sword of the Headhunter is brandished once more. In the pitch-blackness created by shrouded mysteries - Fianna's House, Humpty Dumpty - one truth comes to light. But is the price for this truth much too high?

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, inescapable 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, do they lead only to crushing despair for Oz, or is there some shred of hope for him to grasp on to?

Guided by Jack Vessalius, the man from Alice's memories, Oz wanders back into the world of lost memories in search of Alice. There, he stumbles upon the devastating tragedy of Sablier, the century-old disaster which sent the old capital into the Abyss, an incident of which no one has any recollection...except Alice, who was there?! When Oz discovers the truth of the memories Alice so desperately wants to forget, the powers of the B-Rabbit will spiral out of control and threaten the lives of all who are trapped within the dreamlike dimension, including Alice herself...

"What those people are looking at...isn't me." Though Oz's sudden appearance in the midst of Pandora wreaks havoc, the initially chilly reception to the prison-breaker runs more than warm when Jack Vessalius, hero of the tragedy of Sablier and the man from Alice's memories, manifests in Oz's body. Sensing Oz's resultant inner turmoil, Uncle Oscar drags Oz and company on a "mission" to Lutwidge Academy, where Oz's little sister, Ada, is a student. But some carefree fun and a tearful reunion ten years in the making is not all for which Oz must prepare himself: crimson-cloaked foes are lying in wait to torture him for answers about the events of a hundred years ago...