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? Leila's 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 father's 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... Yuki's second life as a demon lord is shaping up to be anything but chill!