The world has grown still in the Twilight Age. Oceans have receded, birthrates have plummeted, an unknown plague ravages the land, and grotesque creatures of unknown origin roam freely. Into this decay steps Theofrad, Archduke of the Sorcerous City of Energeia, who has discovered a new energy source called Ether that may save the realm. The Holy Dragon Empire Granleyd has declared Ether heresy and launched a holy war against Energeia. Too outmatched for a direct confrontation, Theofrad relies on the Labyrinth defense system to ensnare invading forces. Aided by Succubus Secretary Rein, Artificial Embryo Lala, and the mysterious girl Titie, he prepares to welcome any would-be invaders — and fight an entire unified world to save it.