In the not-too-distant future, mankind relies on tiny, telepathically controlled robots to perform such dangerous tasks as deep-sea research, disaster relief and interplanetary exploration. These popular and easily customized Robos also form the favorite sport of tomorrow: battling in the holographic arenas called holosseums. Now that criminals have taken to using these mighty miniature machines as weapons, the Custom Robo phenomenon has grown into a problem for the whole of society.
A young boy transfers to a new school, where he meets Robo-battle champion Saki, a young girl who won the championship partnered with her brother. Now, shes looking for a new Robo Commander to groom into a champion, and in this young boy, she sees remarkable potential. However, Saki has a secret, and when the young boy discovers the truth about his new partner, his world changes forever.
