Maou no Hajimekata

Aur, who acquired the power and authority to become the Maou after a lifetime of study, expresses deep distrust toward humans, believing they will inevitably betray him. He summons the succubus Lilu and begins constructing his own domain, a vast labyrinthine dungeon. The story centers on the Maou's efforts to build his world, featuring a dark fantasy setting with elements of a harem.