After a run-in with a member of a group that opposes the goddess's leadership of Gamindustri, Neptune is accidentally thrown into another dimension, which turns out to be an alternate version of Gamindustri set in the 80s called the Ultra Dimension. From there, she meets that dimension's CPU counterparts from her own and soon helps them into stopping a group called the Seven Sages from taking down the CPUs of the Ultra Dimension, while she also finds a way back home. However, things soon begin to escalate that leads them into fighting to save both the Ultra Dimension and the Hyper Dimension.