In a future city called "Mirror City" made of seamless mirrors, a man code-named "Zero" wakes up with complete amnesia. The city is managed by a ubiquitous artificial intelligence "hub". The memories of residents are the fuel that keeps the city running and the ultimate cage that binds them. In order to find the answer to the ultimate question "Who am I?", Zero must join forces with the mysterious woman Eve to fight against the memory retrieval of the "center" and travel through the fragments of memory intertwined between reality and fiction. He gradually discovered that his past seemed to be inextricably linked to the birth of this city, and the only key to escaping here was hidden in the deepest memory that was taken away from him.
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