Sara Werec yearns to follow her brother Ralph and take up the Union cause in their fight against the Deague. Ralph is a legend among the Reasoners – warriors who bravely steer their advanced mech units headfirst into combat. Sara’s hopes are soon fulfilled, but the horrors of war spare no one. Sara loses everything when Ralph commands a Deague assault force in a surprise attack against the school. She boldly undertakes a new mission: Confront Ralph to reveal the motives behind his betrayal.