In a future city where emotions are quantified into energy "spiritual matter", there are two worlds: the upper level is the Sky City that consumes pure spiritual essence and enjoys absolute rationality, and the lower level is the turbid current where emotions are extracted and struggles in chaos.
Ling Ye is the sharpest blade in Sky City - a scavenger who cannot produce any emotions, code-named 9650. His mission is to eliminate all "emotionally out-of-control individuals" and maintain absolute stability in the system. His life was supposed to be a straight line without ups and downs, until an unexpected mission. A wave of "pure joy" penetrated his defenses and planted a dangerous seed called "feeling" in his dead heart.
System failure? Or is it the bud of humanity?
In order to find the answer, he stepped into the forbidden area and met a girl with red eyes who could "resonate" emotions. The lies were peeled away layer by layer, and he discovered that his existence itself was a huge conspiracy. When Sky City decides to carry out the final "emotional cleansing" of all mankind and erase the emotions that are considered taboo, this former insensible person must make a choice.
Is it to return to cold perfection, or to embrace human nature full of pain?
This is a story about machines regaining human hearts and prisoners breaking out of their cages. When the emotions of the world converge at a singular point, will what explodes be destruction or rebirth?
