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

Reborn in another world as a demon lord, Yuki is managing his newly-and accidentally-acquired phantom ship dungeon. At the same time, he's steadily working on expanding and strengthening his existing territory. Then, one day, he thinks it's about time for him to stop neglecting his duties as the Dragon King, so he decides to visit the Dragon Hamlet and introduce himself to its residents. He and Lefi take to the skies to get there, but on the way, they encounter a massive airship under attack by monsters. After helping the humans operating it, they resume their journey and finally arrive in the Dragon Hamlet, where they're greeted by the elders. He pours his magic into a stela to carve his name into the dragons' annals as their newest Dragon King, but then...

The war between the Raceless Allies and the Human-Demon Axis has ended, and Yuki finds himself the reluctant owner of an entire empire. Since the other leaders have things well in hand, he takes a breather and heads home to the dungeon, where he suggests to his family that they go on a trip. Their destination? Leilas hometown, where the ovine race lives! So off they go on an airship, the visit both a homecoming for Leila and a reunion with her wise teacher, Eldgalia! On top of all that, Yuki has a wedding to plan with Lew because her fathers one-year deadline for them is coming up. Meeting the parents? Nope, meeting the whole werewolf clan! And then Lefi makes a shocking announcement too?! Not to mention the unexpected weapon Eldgalia forces on him... Yukis second life as a demon lord is shaping up to be anything but chill!

Our errant, determined antihero Yuki heads off to Alisias royal capital to team up with Nell and the demons on a mission. Unfortunately for him, he finds himself kidnapped! Thankfully, the Supreme Dragon, Lefi, rushes to his side, and they manage to stop trouble in its tracks, which means they can return to their peaceful, bickering-filled, frolicsome days. One day, Yuki and the gang decide to visit the dwarves homeland. What better place to search for clues about the divine weapons in his possession than the holy land for weaponry? Off he goes to the shrine revered by the dwarves, where he discovers a stone slab with instructions written on it. After following the instructions, he touches the slab, only to lose consciousnessand awaken in a stark white, empty void where a variant of the God Spear awaits him! Will Yukis trip lead to a sudden job change from demon lord?!