And so begins a grand epic of intertwining destinies; a tale of God, of angels, demons and humans living amongst the walls of the floating purgatory, Tokyo Babel -- a soaring bastion erected in the image of Tokyo, one of the largest cities of a world succumbed to the apocalypse.
What drives its few survivors onward to the gates of Heaven in a world ravaged and bereft of God?
And what exactly is this Heaven, for that matter? What aspirations could the angels and demons harbor in an era where the gates of both Heaven and Hell are shut tight even to them?
What plans does God have for his flock?
Whence should mankind seek guidance with their Lord silent? What choices still await them?
Aoi Minase, a boy whose dreams were shattered has returned to his hometown of Kazegaura where there ,on top of a hill lined with windmills, he encounters a wheelchair-bound girl, Kotori Hanabe, and a large, white glider soaring through the sky.