Joined by humans, they embark on a pilgrimage across the seven layers of Babel, hoping to ascend Jacob's Ladder in an effort to re-open the gates of Heaven. Their journey would be an atonement toward the heavens.
And yet, their plans fall into ruin as a group of pilgrims -- their minds consumed by madness - set out to lord over the numerous layers of Tokyo Babel with the intention to wreak complete and utter havoc atop the floating purgatory.
Amidst this neverending impasse, a lone youth is saved from the ruins of his devastated world - Tendou Setsuna, a man denied human treatment since birth.
Joining his savior, Lilith - known as the Witch of the Night, he begins his journey across Tokyo Babel...
...yearning for an answer to a single question: Why he still possesses the will to keep on living.