A young genius programmer has a passion for building model robots. After dying in a car accident, he finds himself reincarnated in a world where robots are real, and he can pilot and build them!

After his defeat of the Behemoth, Ernesti goes to the capital to be rewarded. But the king is cautious about this new child who can take down a monster that easily defeats armies, and sets for him a difficult task before his reward can be given.

After two draws, it's time for the final showdown against the Vyver! The capital city is almost at hand, and all that remains for the Western Grand STorm to come to a close is for Ernie to defeat the huge wyvern mech.