On the First Day of Retirement, Buy a Devil as a Maid

Ash, the strongest warrior in the history of the Holy Empire. After "killing" the Demon King in the final battle, he saw through the high-ranking officials of the empire and decisively faked his death to escape. He ran to the border and opened a shabby tavern. He just wanted to live a retired life of fishing and raising cats. In order to be lazy, he bought a silver-haired loser girl on the black market who had lost all her magic power and had a very bad temper to work as a waiter. The girl can smash the plate when she is carrying it, and she can break the glass when washing the cup, but she is so proud and arrogant to the extreme. Ash thought he was taming wild hedgehogs, until one day, pursuers from the former empire and demon rebels joined forces to attack the small town. Looking at the thousands of troops outside the door, Ash sighed and was about to pull out the holy sword that was gathering dust under the bed. But when they saw that good-for-nothing maid who could even fall while carrying a plate, she suddenly burst out with a devastating abyss of demonic energy, blushed, raised a pan and rushed out the door, roaring: "If you dare to disturb my wife and Ash's dinner, you ants will all die!" The thousands of troops outside the door were so frightened that they knelt down and begged for mercy. Ash: "???" Looking at the Demon King's horns condensed on the girl's head, Ash fell into deep thought. Wait, isn't this the defeated demon king that I let go without mercy?