Emil Chronicle Online takes place in the land of Acronia. There exists three races; Emil (human race), Titania (angels), and Dominion (demons). In relation to our understanding of the worlds Tatania is above the world of Acronia, while Dominion is below it. In the distant future the civilization completely depleted the earth's valuable resources. In its search for new resources worlds which were never meant to be connected were bridged. Complete chaos ensued between the three races. Humans entered into the heavens and underworlds, realms never meant for them.