After Demon Lord's revival, they waited eagerly for the hero who should have been summoned at the same time, but when years passed without any sign of them, Demon Lord disguised themselves and ventured into the human world, following the trace of the hero's soul. Demon Lord doesn't know whether this hero is male or female, or anything about their appearance or name. All they can sense is the hero's soul. Demon Lord possesses immense power and is humanity's enemy who could devastate this world, but due to their eternal, repeating fate, they harbor extraordinary feelings toward the hero—something that could almost be called a bond. Demon Lord refers to themselves with an air of authority and formality, befitting their status. At the start, they assume the hero has come to the brothel as a customer, but will realize the hero isn't one of the male clients.