A year has passed since Princess Ai returned to troubled and war-torn Ai-Land, flanked by the now-loyal Furies. Ai led the Second Revolution to a successful conclusion and took the throne of Ai-Land, co-ruling with her half-brother, the radical Angel leader, Nora. But all is not well in paradise, as Ai struggles with loneliness, isolation, and the pressures of rule. And back on The Other Side, things are not as they should be, either. Mysterious forces have gathered and threaten to push both worlds to the brink of destruction...

Ai fights to escape the clutches of her mysterious and malevolent captors, not knowing whether Kent, left behind on the Other Side, is even still alive. A frantic rescue mission commences, and in the end, even Ai's magical voice may not be enough to protect her from the trials of the Black Forest. Dark secrets are revealed, and Ai must use all her strength and courage to face off against the new threat to Ai-Land. But will she ever see Kent again...?