The world has come to an end, of sorts, in this thrilling anime adventure. The skies roil with strange visions, killers take wing (literally) to find their prey and humans are cowering in fear. Amid all this chaos, a brother and sister arise from the shadows gifted with supernatural powers. The overlords know what they're capable of, a knowledge that's driven them to hunt the pair down. Can the siblings get away before they're found?