536 AS (After Starfall), the world is ravaged by the demon army, and is in dire need of a hero. That hero just so happens to be a powerless peasant who is killed by the enemy, but his story doesn't end just yet. He is reincarnated with a dying wish to vanquish the evil, if given the chance, as a newly-made Marquis. Kazuto Tetsuya must go above and beyond the limits which he had struggled against in the past (future?), and make hard choices. In this story, Kazuto must make the best with what he has available, to ensure his own safety and the safety of those he would want to protect. For this, Kazuto pushes himself endlessly to strive against the demon kin even before the invasion occurs. Kazuto must identify the truth of this world, and make a decision.