The Earth has flooded. The only signs of humankind are the waterlogged structures they left behind. Peeking out from the deluge are the remnants of a zoo, home to rare and endangered animals, survivors of long neglect. Tender-hearted NOA is a construction robot who's found new purpose as the caretaker of the zoo's beleaguered inhabitants. Bracing for the next storm, NOA builds an ark from the wreckage in search of new land and a new home, only to discover something even more profound.