In the future city "Mirror City" where memories can be erased and traded, a man code-named "Zero" wakes up in endless void and loses all his past. He was implanted with a false identity and became a screw that kept the city running. However, the broken memory fragments are entangled like ghosts - a woman's profile, the smell of rain-soaked earth, and a desperate cry. The appearance of a mysterious woman named "K" drags him into the underground undercurrent. In order to find the answer to "Who am I?", Zero must sneak into the memory maze built by data and lies, fight against the huge shadow that controls everything, and uncover the cruel truth buried under the bright surface of Mirror City.
