Story
Film by Studio 4°C — Winter 2016, 1 episode, Finished.
Due to the destruction of nature, the disruption of ecosystem, and also massive wars using nuclear bombs and biological weapons since 20 centuries, the earth fell into ruins. The ground was collapsed and polluted, and many kinds of plants and animals became extinct. The earth encountered the 6th mass extinction: The Big Six. During the time, humans built the aero police to save endangered species. In this isolated city in the sky, various animals evolved over the years through genetically modified mating. As a result, they started walking on two legs and acquired language.
Synopsis via AniList (English).
Trailer
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