In the future city "Xinhai City" where memories can be traded, stored or even deleted, the top memory retriever-"Raven" makes a living by salvaging lost emotions in the flood of data. He is calm, mysterious, and seems to have forgotten his past. One day, a woman named Lin tide came to the door with a bizarre commission: she had lost a memory that was crucial to her, and the only clue was a "blank fragment" that could not be read by any device. Raven took on this tricky business, but he never expected that the depths of this blank memory not only hid secrets that could subvert the city, but were also closely connected to his own dusty past. On this island built of data and neon, they must dive into the deep sea of oblivion together and face the undercurrent of the truth.