Thousands of students have lived comfortably inside the high walled, secluded boarding school in the countryside since they were six. They are fed, lodged and taught a strict curriculum. Every Sunday evening, five students graduate via the lottery. The Lottery selects the best students eligible for employment in the city and an opportunity to reunite with their parents.

Kate grows impatient with the lottery. Fed up living in the compound. Her heart yearns for a new exciting life beyond the walls, but there is no other way out.

Unexpected turn of events unravel. A mysterious explosion erupts. Blaze scorches down the compound into ashes. Forcing her to flee out of the yard for the first time. She is stuck in a difficult situation: wait for the authorities or escape with other students. She chooses the latter. As they maneuver through the treacherous terrain, they discover a gruesome secret about the Compound and the sovereign state of O2mata.

The Mainframe is a dystopian story about the teenagers' hope for a better life and reuniting with their parents in the city, but veers into black terror. They have no choice, but summon qualities they have never exhibited before: courage, defiance, self-preservation and camaraderie against the tyranny of the post-robocalyptic world.