Sudachi no Maoujou is a Manga/Manhwa/Manhua in english language, ACTION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

The hero defeated the Demon King and the world became peaceful-despite the fact that the boy in Saisho village, Murabito, was in trouble. Because it's too peaceful for his tool shop to have any customers! If nothing is done, the store will be closed ... What is the identity of the girl who appeared at that time ...!?