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

Yuki finds himself reincarnated as a demon lord in another world, and he's been put in charge of a dungeon to boot! Once Yuki accepts that his fate hinges on the dungeon's survival in a world where powerful monsters roam free and danger lurks at every corner, he begins gathering allies and bolstering his defenses. Within a few days, he takes on a legendary dragon, an adorable pet slime, and a vampire girl, but despite all his precautions, life as a demon lord in a dungeon constantly under threat...

Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono suru has been published digitally in English as Now I'm a Demon Lord! Happily Ever After with Monster Girls in My Dungeon by J-Novel Club since May 10, 2023.