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Humanity Has Declined manga series is based on a light novel created by Romeo Tanaka. The manga is illustrated by Takuya Mitomi, and it originally ran in Shogakukan's Monthly Ikki magazine.
It only published one volume on July 30, 2012.
|Name||Humanity Has Declined|
|Romaji:||Jinrui wa Suitaishimashita|
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|Aliases||Jinrui wa Suitaishimashita|