Now I'm a Demon Lord! Happily Ever After with Monster Girls in My Dungeon: Volume 6 oleh Ryuyu

Yet again, trouble finds Yuki and disrupts his idyllic life!

Yuki’s boisterous new life as a demon lord in a fantasy world continues. One day, while he and his pets are hunting monsters to refill the dungeon’s rapidly depleting coffers, he abruptly runs into Lew’s father. “Give me back my daughter!” the man roars angrily, and misunderstandings lead to him challenging Yuki to a duel. How is our antihero supposed to deal with this hairy development?!

In the meantime, Nell, Yuki’s second wife, decides to return to the royal capital as part of her duties as a hero. Yuki means to accompany her as her bodyguard, but an unexpected incident disrupts that plan—someone sets a wild stampede in motion against them. On top of that, a sinister presence lurks in the shadows, intent on targeting Nell. Can the two put a stop to these threats?!