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
Source: ANN. Will be replaced by a unique synopsis written by Anime-Planet and updated tags.
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