In the distant future, a conflict rages between the IMC and the Frontier Militia across the galaxy's outer colonies. Jack Cooper, a rifleman in the Militia with aspirations of becoming a Pilot, is stranded behind enemy lines when his mentor is killed in action. Bonded to his mentor's Titan, a massive combat mech called BT-7274, Cooper must complete a mission he was never trained for while being hunted by the IMC's elite mercenary forces.