How to Build a Dungeon: Book of the Demon King Vol. 3 (manga)

In his quest to expand his dungeon, Aur's got plenty to do: a king to kill, a new land to rule, monsters to ravish, and a harem with hungers that never seem to be satisfied. After paying a visit to a magic shop (and its beautiful owner) that caters to the adventurers who loot his dungeon and slay his monsters, he decides to take a turn navigating his perilous underground kingdom. Can Aur conquer the dangers of the dungeon he himself built?