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Ling Lu, who suffers from a hidden disease, encountered a black cat from another world after an accident. Then many strange events appeared in her life: people kept disappearing mysteriously, "people" appeared out of thin air to replace the identities of the missing people, everyone's memories were tampered with... All the weird and impossible events occupied Ling Lu's life; The conspiracy behind this is actually related to Ling Lu's life experience. In order to find out the truth, Ling Lu signed a contract with a black cat that can transform into a human form, and embarked on a journey to find the mystery of her life experience...