A thousand years ago, a metal box measuring several feet in each direction fell from the sky as the world burned. Survivors of the apocalypse found it, called it a gift from the gods, and made it a central piece of their religion. Now, in a rebuilt world, the box has been locked away in a government vault for many years. It would have been forgotten if it hadn't opened, allowing a very cold girl appearing to be ten years old to crawl out. She knows nothing from before, but learns the reason she was in the one of those lost memories was meant to stop another apocalypse.