AKB0048 and NONAME. They brought peace and Music across the galaxies. The Sub Unit of AKB0048, 'NONAME' was made up of the 77th Generation and the 75th. After Nagisa became Atsuko Maeda the 14th, Her Generation started to became Successor as well.
Everything was going great as Atsuko became the new Center Nova,
Intill the Idol Massacred. That Massacred killed every Idol on Akihabastar. The successors, trainees and everyone else who worked for them. Akihabastar and the rest of the planets were taken over by Zodiac, who planned everything. Then, Tens years later, A rebellion against DES began and they were thrown out of Akihabastar, by the newly created AKB0048.
Now, Fifty years later, the daughter of Zodiac has been sent to AKB0048 to become Center Nova.
Will she discover the Truth about the Idol Massacred and will she become Center Nova?
It might sound sad, but its not.