Since ancient times, humans and monsters have waged bitter war against one another in the bowels of the treacherous dungeon beneath Orario. Enmity between these races is an accepted and immutable fact — or at least it was until Bell Cranel stumbled across a young, blue-skinned girl in the dungeon’s dark depths. When this inhuman young woman speaks to him in the language of human beings and looks at him with all-too-human eyes, the land of Orario erupts into turmoil the likes of which it has never seen.

[Source: Crunchyroll]