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

Before he knew it, Yuki had become a Demon Lord and the master of a dungeon. Thrust into a perilous world teeming with giant monsters fighting for survival, he initially focused on developing his dungeon simply to stay alive. Yet, to his surprise, he found himself thoroughly enjoying the experience. How did things end up this way? Now adapting to life in this new world, Yuki relies on his bold instincts and sharp senses as he spends his days alongside a supreme dragon girl and a vampire girl. Whether laughing together or facing moments of frustration, he passes the time doing exactly what he pleases in a surprisingly heartwarming daily life.