Now I'm a Demon Lord! Happily Ever After with Monster Girls in My Dungeon (Manga) Volume 2 oleh Ryuyu

Reborn as a demon lord in a fantasy world, Yuki is living his best life without any restrictions! Every day is full of fun and joy when he’s with Lefi, the freeloading Supreme Dragon; Fluffrir, his pet fenrir; Iluna, his vampiric little sister; and Shii the slime. But one day, Iluna suddenly vanishes. Realizing humans are behind her disappearance, Yuki heads up a rescue mission and, with Lefi’s help, raids the nearest settlement in search of the little girl. He won’t let anything or anyone ruin his idyllic second life! Yet dastardly human designs are destined to be a thorn in his side when the human kingdom’s crown prince and his greedy supporters set their sights on the Demonic Forest...