Sudachi no Maoujou

The heroes have defeated the Demon Lord and the world is finally at peace - but Murabito, a boy from the village of Saisho, finds himself in trouble. The problem is that the world is so peaceful that his adventurer supply shop no longer has any customers at all! If things continued as they are, the shop be forced to close… until a girl appeared…

(Source: Magapoke, translated)