After the giant rogue iDOL is defeated by Makoto, Haruka is given an offer she can’t refuse: to become an iDOL Master. Her friend Yayoi is convinced that the organization is swindling her, and leads her on a wild goose-chase trying to track down the truth.

Haruka and the others are at the beach, but this is no vacation – they are performing activation tests and pilot training for Imber and other iDOLs in the same town where Imber and Nebula were manufactured.