Now I'm a Demon Lord! Happily Ever After with Monster Girls in My Dungeon

Yuki awakens to find himself reincarnated as a demon lord in a foreign world. On top of this, he’s been given the responsibility of managing a dungeon. Accepting his task, Yuki takes note of the predicament he faces in a world where formidable creatures roam freely and danger looms around every corner. In order to ensure the dungeon’s survival, Yuki gathers allies and fortifies his defenses. Throughout his journey, he befriends a legendary dragon, a cute pet slime, and a vampire girl. Despite his willingness to take every precaution, life as a demon lord in a dungeon constantly under threat is surprisingly calm.
However, with an eclectic group of characters at his disposal and more likely to come his way, Yuki is bound to encounter some obstacles. Will he be able to pull off a daring rescue mission? Furthermore, how will he and his monster girls fend off an attack from a hostile human kingdom?!
Join Yuki as he balances his regular life, his duties as a recently appointed demon lord, and his expanding family of monster girls and pets.