Welcome to the world of Little Battlers eXperience! In the near future, a boy named Van Yamano owns Achilles, a miniaturized robot that battles on command! But Achilles is no ordinary LBX. Hidden inside him is secret data that Van must keep out of the hands of evil at all costs!

A year has passed since the fierce battle against the New Dawn Raisers. Suddenly, every LBX around the world starts going out of control. In order to solve this baffling case, Van Yamano heads out with his new partner, Hiro, on a journey around the world!! Double LBX Tournament arc, Battle Start!!