This is a story of the bonds that form between people fighting under extreme circumstances.

On one of the countless parallel worlds that exists in space-time, humanity has been waging a decades-long war against aliens known as BETA (an acronym for “Beings of Extra Terrestrial origin which are Adversary of the human race”) using mecha called Tactical Surface Fighters.

Driven almost to the brink of extinction, how do these humans contend with their harsh fate?