A world protected by four goddesses, known as CPUs. These four CPUs are locked in a conflict with one another for world domination. Later, this battle would come to be known as the Console War. The land where humans reside has been overwhelmed by monsters released by someone known as Arfoire.
During the Console War, one of the goddesses - Neptune - was defeated by the other three, and was exiled from Celestia to the lower realm.
It is there that Neptune meets IF and Compa.
Under the guidance of Histoire, she begins her journey to explore the four lands of Gamindustri...