500 years ago, after the creation of the human world on the border with the demon world, the human world and the demon world fought on the ground. And as time goes by, a princess, a descendant of heroes, is born in the kingdom. However, the princess who was chosen by the Holy-Sword was a tyrant with immense strength… Literally, there were rumors that she wore armor and roamed the battlefield, swinging her sword if it wasn’t good enough, and even using someone else’s back to resting on his feet. Then one day, a crisis hit the serene royal palace. The princess who went for a walk to conquer the demons wore a dress for the first time and entered the palace. “Father, I want to marry!” What kind of poor bastard could this poor princess catch? “He’s the Demon King!” Will the kingdom be able to keep the peace safely?