The CPUs of each of the four nations are locked in heated battle against one another for dominion over this world. Just as Noire is one step away from complete domination, the CPUs are suddenly robbed of their powers by an unknown force. Now in order to save the world from destruction, the four CPUs must unite Gamarket and defeat the onslaught!

Unlike previous Hyperdimension Neptunia games, Hyperdevotion Noire is not set within the world of Gamindustri, but instead within a similar, but separate, world known as Gamarket! This time Noire takes the lead in grid-based tactical combat with familiar friends at her side. Customize units, activate special abilities by linking characters through the Lily System and outmaneuver enemies on the battlefield, all the while earning points to personalize your home base in Sim Noire mode!