Many people have searched for it, many have stolen it, and many will kill for it. The Gad is a seemingly magical stone which, once making a strong spiritual connection with someone, will grow into a very powerful robot known as a Techode, a mechanical being that embodies the will of the bonded person.

This is the story of Hajiki Sanada, a boy struggling to help support his fatherless family in an electricity-impoverished city known as Night Town. One day he encounters the Gad and a special bond is formed. Now his life will never be the same...