(DnD, Western fantasy, non-reincarnation, middle-demon world)
Cyril, a down-and-out nobleman who became a slave, accidentally signed a life contract with an unknown existence and obtained the "key to the door" that can open everything. Before he fully realized the change in his destiny, he was involved in the struggle of the supreme existence. Can he survive in troubled times by relying on his "god-given" abilities, or even change his destiny and conquer the world?
