Lieutenant Kei Katsuragi, a fighter pilot, receives a mission to protect a new untested bomb, the Space/Time oscillation bomb. During the mission the bomb goes off, and it produces a catastrophe.

Twenty years later, the Emaan, a group of techno-gypsies find Kei unconscious and take him with them. Kei soon discovers he is in another dimension and that the Emaan aren't human.