The Try Fighters have been invited to a tropical island to be test pilots for Nielsen Labs! Shia, Minato and Gyanko have been invited, too. But there's trouble in paradise... The crystal Nils created is going out of control, and Gunpla are starting to move on their own!

Nils Neilsen invites Sei Iori, Meijin Kawaguchi and the rest of the group to Yajima Stadium in order to try out his new large-scale battle system. Sei is just about to unveil the improvements he's made to his Gunpla, when a mysterious group appears and challenges them all to a Gunpla Battle!