300 years following the Rapture, Humanity struggles to endure as it fights alongside the Army of Heaven. Captain John Miller, a Pilot for the United Earth Military, has a chance encounter with a Demon and learns he is not in any way who he thought he was. Struggling to determine who is, he must learn new ways to live in order to ensure his survival. However, he is not being told the truth by the Angels and must unravel the mysteries surrounding his parentage and discover the reason why he exists. Who is John Miller? Is he Human or Angel or is he something more sinster.