Tōbō-saki wa maō no danjon?

A female soldier who had lost her country and was in the middle of fleeing alone, Miliaria von Vrauwalt, entered a suspicious cave inside the​ forest. When she entered that cave, inside there was the female demon king, Iris, who had been forgotten in history slumbered in her long sleep. When she woke up, Iris falls in love with Miliaria on first sight. In order to protect Miliaria from pursuers, she remade the cave into a dungeon.

A female soldier who had lost her country and a female demon king who became a dungeon master. Two people with unique combination, sometimes​ irritating, sometimes​ sweet, sometimes​ a fierce battle, this is a story of such thing.