Hyperdimension Neptunia U: Action Unleashed (超次元アクション ネプテューヌU, lit. Super Dimension Action Neptune U) is a spin-off action game for the Hyperdimension Neptunia series. It was released for the PlayStation Vita on August 28, 2014 in Japan and on May 19, 2015 in North America.
A world known as Gamindustri (ゲイムギョウ界, Geimugyō-kai, a pun on ゲーム業界 Gēmu gyōkai, "game industry") protected by the divine aegis of the four CPUs (Console Patron Units, the goddesses) and their sisters, the CPU candidates. Even in this world the seeds of evil don't die out, and since brutal enemies along with ferocious monsters that appeared were quickly defeated by the collaboration between the CPUs and the CPU candidates, not only the goddesses themselves but also the inhabitants of Gamindustri ended up very bored. Due to that, the goddesses discussed an interesting proposal.