At the time the current situation on Earth was that Pure had taken over nearly all of the Shelters. They had secretly taken out the big suits behind the scenes that were in charge of multiple important resources, resources that were needed for human society to function. One such type had factories that dealt with Glathrium, one of the strongest materials that existed. Because of this, at the same time, Pure were able to do an attack from within and the outside.
They now controlled the military, the Earthborn group that was once protecting the Shelters and Earth. People had no idea who they were really following, but in the end, all roads led to the one known as Pure, and the one behind it, was none other than Zero.
Because of this, two people had been given a task, a task to slowly reclaim back earth from them. Leo and Sera. Leo was one of the most trustworthy men that Quinn knew and on top of that, he had experience working with the military and plenty of battle tactics.