The prophesied end of the Zemurian continent draws near, and so does the launch of humanity's first foray into space. A sudden invitation from Marduk to cooperate in a high-tech training exercise sets Van Arkride, Ashen Chevalier Rean Schwarzer, and Father Kevin Graham on a collision course with the secrets at the very core of Zemuria.

Their paths may diverge, but the ultimate question remains the same: Just what lies beyond the edge of the horizon?