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!

To save his father, who is being held hostage by the nefarious Cillian Kaido, Van must win the Artemis Tournament to secure the main prize-the only thing Cillian will take in trade for his dad. But his next opponent in the arena is a fierce one...Cillian's grandson, Justin Kaido!