Defeating the Demon King finally brings peace—and an economic crisis for everyone whose livelihood depended on war. Corio, a business student and son of a weapon-shop owner, returns home to find his family store near bankruptcy because adventurers no longer need swords and armor. With his family unable to run the shop, Corio must rethink what a weapons business can become in peacetime and find a way to survive in an economy transformed by victory.