After years of futile conflict between Gamindustri's four realms (Planeptune, Lastation, Lowee, and Leanbox) over Share energy, the source of their power dependent on how much their people believe in their goddesses, the four CPUs who reign over them have finally forged a friendship pact. The pact prohibits any effort to seize Share energy by using armed force in the interests of bringing peace and prosperity to their worlds. Nonetheless, a month after the pact, Neptune, the CPU Goddess of Planeptune, spends her time fooling about and playing games instead of completing her job, causing her land's Shares to drop. Choujigen Game Neptune The Animation continues Neptune and her pals' efforts to raise Shares while coping with an external threat that might herald the end of the world.