Effectively, this game is a JRPG based on the gaming industry / console wars. In the world of Gamindustri there are four regions - Planeptune (Sega Neptune), Lowee (Wii), Lastation (PS3), and Leanbox (360) - each protected by a CPU goddess - Neptune/Purple Heart, Blanc/White Heart, Noire/Black Heart and Vert/Green Heart.
The other 3 goddesses decide to gang up on Neptune and defeat her, causing her to lose her memory. The game involves trying to restore her memory and save Gamindustri from the evil Arfoire (named after the R4 flashcard).
Trailer - https://www.youtube.com/watch?v=z27LSWNKhPg
ReBirth is a significantly improved version of the PS3 game - the Vita version has a metacritic rating of 72.
This isn't a new addition to the sale, but I thought I'd give a heads up for anyone interested as it doesn't seem to have been posted. I don't expect much heat as this is very niche!
The game is PSN-only in Europe, and was only released in August - usual price £32.99.
The Producing Perfection spin-off is also £14.99 (£13.49 with PS+), but this was cheaper previously and retail copies sell for about the same price.
Gamindustri: One of many parallel universes protected by four goddesses known as CPUs. Long ago, these four CPUs engaged in a war for supremacy known as the War of the Guardians. However, this war weakened their protective hold on the world inhabited by their people, and in turn it was flooded by monsters under the influence of an individual known as Arfoire.
During the War of the Guardians, one of the CPUs—Neptune—was defeated by the others and hurled down to the world’s surface from the heavens. The drop caused Neptune to lose her memories, as learned by Compa and IF, who happen upon the fallen girl. A mysterious book containing knowledge of all Gamindustri’s history suddenly speaks out to Neptune, Compa, and IF. With the assistance of this sentient book, the trio embark on an extraordinary journey across four different nations on a quest to save the entire world!