You, a very ordinary traveling merchant, unexpectedly inherited land one day from your aristocratic uncle who passed away suddenly. Now, you have become the lord of that land. However, it was not a territory governed by humans, but a domain of the demon nation called Nova Roma Empire, known as the strongest on the continent! Moreover, the inheritance was not from an ordinary aristocrat but from Duke Saraman, one of the four major noble families of the empire. Without any time to be surprised by the abrupt transition from a human merchant to a great demon noble, the daily duties of being a duke swiftly approach.