Hyperdimension Neptunia x Male Reader

(Based on the English-dubbed version of "Hyperdimension Neptunia: The Animation".

This is Gamindustri. Beings called the God and Goddesses rule the countries of this unreal world. The five CPUs govern four states: Neptune (Purple Heart) of Planeptune, Noire (Black Heart) of Lastation, Blanc (White Heart) of Lowee, Vert (Green Heart) of Leanbox, & Y/N (Cobalt Star) of StarCube. For many long years, these countries have fought each other for Share, the source of each CPU's power. However, fearful that the conflict would pointlessly erode their countries' strength, the CPUs of each nation signed a Friendship Treaty forbidding them from taking the Share by force. Under the treaty, the CPUs and their younger siblings, the CPU Candidates took a new stage in their relations. It was the dawn of a new, dynamic era marked occasionally by shared a bit of laughter, disputes as well as cooperation, war, and fear.

What does the future hold in store for Gamindustri? And what is it about Cobalt Star & Cobalt Sister?