Amid escalating political animosity, rival nations Zafran and Revillia resort to war in a bid to acquire the deadly Decimators, ancient war robots with a history of near-apocalyptic consequences. With leaders unwilling to yield, the fate of humanity rests on the daring scheme of Lean, a novice cadet, and Nataruma, a gifted psychic, as they strive to rewrite the catastrophic events of two centuries past.