Maou ni Natta node, Dungeon Tsukutte Jingai Musume to Honobono suru

A man named Yuki is reborn as a demon lord in a different world and given control of a dungeon. He quickly realizes his survival depends on the dungeon's safety in a land filled with powerful monsters and constant threats. Yuki starts gathering allies and strengthening his defenses. Soon, he takes in a legendary dragon, a small slime, and a vampire girl. Despite his efforts, life in the dungeon remains unexpectedly calm. With a diverse group of companions and more possibly joining, Yuki faces potential challenges. He must manage a risky rescue operation and deal with an attack from a human kingdom. He balances daily life, his new role as a demon lord, and growing responsibilities with his monster girl companions and pets.