The Devil Is a Maid

This is a world that is on the verge of dusk due to the ravages of dark angels. The third demon king from the demon world, Saphiroth, traveled through the time and space tunnel and came to the world in order to investigate the truth about the disappearance of her sister Elvite and the defected eleventh demon king Dislua. However, something called the "Preface to Doomsday" followed her like a shadow, secretly pointing to a terrible future. In order to prevent everything from happening, the petite girl who lost the pride of the Demon King took on the mission given by the world.