Xros Heart follows Nene and Kiriha to the Dust Zone, but Taiki's X Loader is stolen by a pack of Digimon trying to defeat the tyrant, GranLocomon. GranLocomon gets a hold of the X loader instead, and Xros Heart must team up with the vagrant Digimon to retrieve the X Loader and save the Zone.
The wave of darkness that Taiki is ensnared by is revealed to be DarkKnightmon's action in an attempt to recruit Taiki. It turns out that Taiki pure heart revokes the dark energy of an orb stored by DarkKnightmon, leading the discards of Taiki off a tower. Luckily, Taiki is saved by Akari and Dorulumon, though his Xros Loader is stolen by a Garbagemon who escape onto a Kettle the Trailmon with his teammates who consist a groups of MetalMamemon and ShadowToyAgumon. During the pursuit, Taiki, Shoutmon, and Dorulumon end up caught between the train tracks as different Trailmon pass by, that is sending trashes all around. Taiki then has an encounter with Puppetmon. Through Puppetmon, the gang soon learns about the tyrant Digimon GranLocomon is ruling the Dust Zone. When Taiki mentioned about Xros Loader, Puppetmon's behavior was turn rapidly by offering himself to Taiki for searching it. Taiki and the others later finds out the hideout of the MetalMamemon, ShadowToyAgumon, and the Garbagemon who stole his Xros Loader. Only then, Puppetmon break into and instead stealing Taiki's Xros Loader. It is later make known that GranLocomon have made a promise to leave the zone if they manage to obtain a Xros Loader for him. However, upon gaining the Xros Loader, GranLocomon reveals to be lying and causing Puppetmon to getting it back. Regaining his Xros Loader, Taiki forms Shoutmon ×4 and destroys GranLocomon. Though it seemed the worse is behind, Xros Heart, Puppetmon, and Garbagemon's gang are unexpectedly attacked by DarkKnightmon, SkullGreymon, SkullSatamon, and Kiriha (controlled by DarkKnightmon's Darkness Loader).