魔王勇者

Fifteen years of border war between the human kingdoms and the demon realm have left both sides exhausted, and it's the Demon King, not the Hero sent to kill her, who calls for an end to it. She lays out why victory now would only trigger a human civil war, and instead recruits the Hero into a scheme built on trade routes, crop yields, and new farming methods to make peace stick. This is the longer of the two manga adaptations of Tōno Mamare's light novel.