Chosen: Battle against robots

In Uni-5 the planet, Robots are invading, the cause, the heart of the beast a orb that is blue and is see through. But who is there to stop them the Anti Robot Corps they use weapons to kill robots and there are 4 people who are the most powerful at that job they are called the ARC M (Anti Robot Corps Masters) they are the most powerful ARC M weapons wielders. But who is the main character you may ask well he is part of the 4 ARC M and his name is Grey he weilds the chosen sword the sword is different from other swords as it requires a vessel who can challenge the Gods. Grey had instantly became a ARC M when he tested the sword and became the welder.