Ages ago, chaos ravaged the world, yet the city of Novus Aether continues to float thanks to the Saint's prayers. However, a disruption in these prayers has caused the "Gran Forte" to split the lower city, claiming countless lives and property.
As a result, the "Prison," the lowest layer of the city, has become a hotbed for crime, famine, disease, and the sex trade, all of which are controlled by "The Noncorroding Gold Chains." Meanwhile, a disease that causes wings to sprout has spread, leading to the formation of the "Wing Hunters" to manage those affected.
Within the "Prison," Caim Astraea, a former assassin turned freelancer, works odd jobs for his friend, "The Noncorroding Gold Chains" leader. During one such task, he comes across Eustia, a winged girl with a pale purple aura akin to that of the "Gran Forte." Their unexpected encounter propels him on a journey to uncover the city's darkest secrets and meet influential figures. In searching for his purpose amid a harsh existence, Caim will reveal the truth about Novus Aether.
