The socially withdrawn young man; Kagami Rokuyou one day faces the reality that his childhood friend Chidori Mamori has been kidnapped by a mysterious entity. The condition for releasing Mamori was to exchange her for a rare medal, which is the winning prize of the Robottle World Championship.

Nine years ago, Kagami became lonely for the rest of his life due to an accident and quit Medabot, but he activated his partner Metabee once again to save Mamori. Can Kagami win the world championship and save Mamori?