"The Moon" is a giant robot created by the millionaire Baron, spending 2.5 trillion yen (at that time). Baron proclaimed that "God is Dead" and created The Moon as a replacement, to serve as a new power to bring justice in a world of wickedness. He entrusts the operation to kids with a pure heart, as he believes only children are the ones able to enact true justice.

Note: Volume count based on the bunkoban.