In the future city "Fantasy Capital" where memories can be extracted, sealed and traded, top memory evaluator Lin Zhou is famous for his calm and precise skills. He analyzes the value of memory for his clients, but always seals up a piece of his own past. One day, a mysterious woman named "Shadow" brings an almost worthless memory fragment - a silver butterfly that disappears in the white noise. This "empty" memory is like a key, opening the door to a huge conspiracy underground in the city. Lin Zhou was drawn into a whirlpool of reality and fiction. He discovered that those forgotten memories were converging into an ocean that could swallow everyone, and he himself was the loneliest island.
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