Eiji Igarashi is one of the latest model Mecha's in the world, but he soon discovers that he is nothing but a copy. And decides to take revenge on the Tenexian government for taking his old life. But when he slowly starts falling into the hands of insanity, will his friends stay loyal? And how can he prevent himself from killing more innocent lives due to his mechanical malfunctions? And how well can he take finding out about his true past, and learning what he truly is?