It is the 53rd year of the Advanced Century, 53 AC in other words. On the first year, 01 AC, humanity's population overburdened the Earth. To deal with this issue, humanity began to populate the stars, creating massive space colonies. However, humanity was unprepared for an attack at that point. The human race was attacked by a race known as 'The Erasers', an alien race who's purpose is to erase from the universe any race that manages to colonize space. When all hope seemed lost, another visitor from beyond the stars appeared to come to their aid. Space pirates. The pirates, known as the 'Chain Masters', soon defeated the Erasers, pushing the aliens back to whence they came. Grateful for the pirates' help, humanity offered them a place to stay. The pirates agreed, and placed it upon themselves to protect humanity should the Erasers return. The Chain Masters provided humanity with new innovations, such as the humanoid machines they used to defeat te Erasers, known as 'Mobile Suits'. Working together, humanity and the pirates built a powerful government that led them into the future.
Until 48 AC, when the pirates' current leader, Captain Darius Brooks, betrayed humanity's trust by ordering the Chain Masters to turn on the human race. Despite sharing the Earth and the colonies, the Chain Masters possessed a much greater amount of military power then the human race. The government's army was ill-equipped to fight against the pirates, as they slowly lost portion after portion of the Earth and the colonies.
But you didn't come here for a history lesson. You came here for ACTION, ADVENTURE, CHAINSAW-Y GOODNESS, and A TALE OF TWO BROS!... Oh, and maybe some fan service for major protagonists being perverts silliness. So, let us begin!
We begin our tale in one of the few remaining countries the Chain Masters have yet to conquer, in a small town called Stillwater near Lake Vico in Italy. It's a fairly quiet town, nice and peaceful and all that. It doesn't have a very large population, and is well known for having some of the best pasta in the world. However, despite this this sleepy little town's only true land mark is the large military base at the edge of the town. This base, known as 'Coraggio di Base', or Courage Base, is known for producing prototype machines in hopes of creating the one machine that will finally defeat the Chain Masters.