Maou Ni Natta Node, Dungeon Tsukutte Jingai Musume To Honobono Suru

Story:

"Before I knew it, I was already a dungeon keeper, a Demon Lord. I suddenly found myself in a dangerous world with giant monsters hanging around, fighting for my existence. So to survive, I decided to think about dungeon development… but strangely enough, I had a pretty good time… And how did it turn out like that?" The protagonist, Yuki, is now forced to live in this world using his brave and sharp feelings and spending time with a girl tall dragon and a girl vampire. "Sometimes laughing, sometimes arguing and living in his own pleasure".