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-feel-tall) walls were erected to split the world, and the half of the human population that survived now live in cities called "Arks." <br><br>
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.

The world has been divided into two halves by a giant wall to prevent the epidemic of "Dark mist". In order to shelter the refugees, artificial cities called "Arks" were built. Shido Enishi is a private detective, who works at the ninth Ark. One day, he is asked to capture a burglar. The seemingly simple case leads him to a great conspiracy.

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