The series is set 150 years after humanity lost half of the planet due to a mysterious black fog . To contain the black fog, 3,000-meter-tall (about 10,000-feet-tall) walls were erected to split the world, and the half of the human population that survived now live in cities called arks . Shidou Enishi , one of the few Japanese survivors, runs a detective agency on the ninth ark. While pursuing a male suspect in a burglary, he learns of a massive conspiracy, one that may be tied to the Rivigarudo syndrome that is mutating its victims into something inhuman.
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