Years of political tension and mistrust between the two rival nations of Zafran and Revillia escalate to the point of war. Each nations solution: to gain possession of Decimators, the same ancient robots of war that nearly ended all life on the planet 200 years before. As the war ensues and the leaders of both nations become reluctant to surrender, only the desperate plan of Lean, a young cadet, and Nataruma, a psychically gifted young woman, to alter the timeline of events 200 years before stands the chance between humanity's survival or absolute destruction. (Source: ANN)

A.D. 2089 - 80 years have passed since Space War I changed the lives of both human and Zentraedi races. Both races are at peace on Earth when a new alien race called the Marduk appear within the Solar System. While covering the first battle between the U.N. Spacy and the Marduk fleet, SNN rookie reporter Hibiki Kanzaki discovers Ishtar, an Emulator that enhances the Marduk's combat abilities through singing. Hibiki brings Ishtar to Earth to teach her the values of life and culture. Together with ace Valkyrie pilot Silvie Gena, Hibiki and Ishtar must find a way to save Earth from total destruction at the hands of the Marduk leader Ingues. (Source: ANN)