The story begins with Taiki dreaming of commanding a Digimon army as its "General" against a force composed of several Mammon, Rhinomon, and Valvemon. He then Digixroses Shoutmon, Balistamon, and Dorulumon into Shoutmon x4, who effortlessly defeats most of the opposing army. Oversleeping, Taiki is woken by Akari using a "move" she calls the "Akari Strike". After encountering Zenjirou, Taiki suddenly hears a melody from nowhere, accompanied by Shoutmon's cries. Taiki begins searching for the source of the voice to save him. Pursuing him, Akari and Zenjirou see a car about to crush Taiki, but he narrowly escapes thanks to Shoutmon's warning. Suddenly, the buildings and surrounding space begin to distort, causing electronic disturbances. Later, Taiki discovers a light along with a melody, and a mysterious voice asks, "do you want to save this melody?" before a Xros Loader appears. After following further instructions from the same voice and once the melody is absorbed by the Xros Loader, Taiki, Akari, and Zenjirou fall into a wormhole-like digital space that emerges from the ground, transporting them to the Digital World. Upon arrival, they find themselves in the middle of the Bagura Army—the same army Taiki saw in his dream—led by Mach Leomon.