At the dawn of the 21st century, Japan descends into a period of financial and political decay. In a bid to rejuvenate the nation, the military engineers the next generation of battlefield weaponry in the form of tactical suits called Tactical Armor (TA). Although TAs provide a substantial boost in mobility, they impose a severe physical toll on their pilots, meaning only a select few can operate them. Yuushirou Gouwa is one such gifted pilot, displaying an unusual aptitude for maneuvering these new machines. As the fourth son of the prestigious Gouwa family, Yuushirou is well-acquainted with the sway of powerful authority. His skills and understanding of the TAs are quickly put to the test, as other geopolitical powers also strive to create their own combat-ready variants. The situation grows dire when Yuushirou meets a mysterious girl who warns him of the future that lies ahead if he awakens a "terror." While he attempts to heed her caution, Yuushirou's family may be more deeply entangled in the escalating conflict than they admit.