Kenichi (Ken) Usagi, journalist turned war correspondent, desperately misses the days before the apocalypse. In the middle of the battlefield that was the United States, he has a terrifying encounter with a biomechanical figure he'd never encountered before. But as shaken as he is by the experience, he realizes this new tech could hold the secret to saving his world.

He sets out with a pair of friends across the war-ravaged land, encountering more strange tech, and finds himself in Mesoamerica. There he encounters one of the giant black pyramids he's observed on his journey. Thinking it may hold the answers he needs, he and his friends enter the pyramid, only to discover it isn't what they think. Will Ken find the answers he needs to take his world back to a pre-apocalyptic time or will he unwittingly ensure his world's final demise?