In the world of Gamindustri, four CPUs (also known as Goddesses) battled for supremacy in the War of the Guardians. One of the CPUs - Neptune - was defeated by the others and banished from the heavens. In her fall from grace, Neptune's memories were lost, but a mysterious book revealed itself to her with knowledge of all of Gamindustri's history. Joined by Compa, IF, and the sentient book known as Histoire, Neptune embarks on an extraordinary journey across four different nations on a quest to save the entire world!

Brace yourself for adventure! This beloved classic follows Estelle Bright and her adoptive brother, Joshua, as they begin their journey to become senior bracers. What starts as a simple mission grows into a battle against a mysterious organization threatening their homeland. As they uncover hidden conspiracies, Estelle and Joshua face increasing dangers that test their courage and strengthen their bond.

In Neptunia: Sisters VS Sisters, you play as the Goddess Candidates, led by Nepgear, who awaken from a two-year-long slumber to a Gamindustri that has been upended by a treacherous threat called the Trendi Phenomenon. While they've been sleeping, the citizens of Gamindustri have turned to using a new device called the rPhone as their main method of communication as they've been unable to leave their homes while monsters lurk outside. Now, work together with friends both new and old to prevent the total destruction of Gamindustri as we know it!