The Shield Hero, Spade Mercs (Devil Survivor), Hikaru (Rayearth), Takato and Guilmon (Digimon Tamers), Sinon (SAO), and Megumin (Kono Suba) thought the Waves would end with the demise of Vepar. They were wrong and the danger to the Babel Colony and Melro continues. They are joined by Keel and Arpeggio El Lalena (Gate), the newest Vassal Heroes, to confront this latest threat.

Captain N for modern times. The Power Bloc came into being to fight the Burning Legion after it invaded Videoland. However, such a large alliance of worlds does not go unnoticed. Other worlds begin to act in response to the rise of the Power Bloc.