Introduction: One thousand years ago,  humanity foolishly  declared war against God. With an army of 5 million strong, they marched up to Heaven's gate, but the army was immediately annihilated by a squadron of angels. Since then, God has enslaved humanity for its rebellion, and now, they now all serve as slaves for Heaven. One thousand years later, a peculiar child is given an offer by an angel to create a oath of some kind......