Ultradimension

Ultadimension is the place where Plutie lives. It is where the third game in the series, Hyperdimension Neptunia Victory, and its remake, Hyperdimension Neptunia Re;Birth3 V Generation take place. It's an alternate dimension to Hyperdimension, in which time moves much slower. It has all the same characters from Hyperdimension, such as Neptune and Noire, but seems to take place in an older era. As such, all the CPUs reflect the first incarnation of their respective consoles instead of the 7th generation of consoles, which is why Plutia represents the Sega Genesis, because as we all know there is nothing that came before the Sega Genesis, which is why it's called the Sega Genesis.

Trivia

• In the Japanese version of the game, Ultradimension is known as Kamijigen (神次元), which means Divine Dimension/God Dimension.
• Even though its status as an alternate dimension states that it has all the same characters as Hyperdimension, Nepgear simply does not exist.