In the "grey area" of the giant city where it rains all day long, human emotions have been quantified into "heart crystals" that can be traded. Ling Su, the former genius emotion purifier, lived in seclusion in Shen Yuan, the lowest level of the city, because of an accident that took away his emotions. His numb heart was touched by a mysterious girl named Nighteye who broke into his life.
Nighteye is the "Holy Grail" coveted by all forces. She holds a secret that can subvert the entire world - a "godhead plan" designed to deprive the entire people of their emotions and create absolute order.
In order to protect her and find his lost humanity, Ling Su was forced to return to the battlefield he had long abandoned. Between the gleaming Sky City and the neon-drenched criminal neighborhood, he must deal with his ruthless predecessor, cunning gangsters and fanatical revolutionaries.
When the eternal night is shrouded, should the brilliance of humanity be cherished, or should it be burned into the only fireworks that illuminate the darkness? This is an escape about redemption, and a war that declares "I still have feelings" to the cold world.
