The Demon King has been defeated, and peace has returned to the world. But for those whose livelihoods depended on the war, this happy outcome is a disaster. With no more battles to fight, adventurers are out of work, and weapons shops are drowning in unsold stock. Corio, the son of a struggling weapons merchant, sees his family's business on the brink of ruin. His father has collapsed under the strain, and his sickly sister Eni faces the horrific prospect of being sold into slavery to pay off their debts.

Just as Corio despairs that his only option is to flee, Eni reveals a miraculous business plan that she believes can save them all. With the help of his childhood friend Kizza, the daughter of an armor dealer, and a sharp-witted moneychanger named Frista, Corio throws himself into an unprecedented new venture to revive the failing shop. But the obstacles are relentless. He must rally not only struggling shopkeepers and unemployed adventurers but also the legendary Hero himself to join his scheme. The desperate son of a weapons merchant risks everything as he fights to turn the post-war economic collapse into an opportunity, aiming for a comeback in what is described as a bold isekai business fantasy.