Synopsis

It's been several centuries since human beings declined due to the steep drop in birthrates. The most prosperous species on the Earth are "Fairies", 10 cm tall creatures with high intelligence. I became a UN arbitrator between the humans and the fairies and returned to my hometown to help my grandfather. I thought my job would not be a tough one and visited one of the fairies' habitats to say hello to them but...

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6

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Related works

8 works in this family
Light novel source
Humanity Has Declined 9 vols Jinrui wa Suitai Shimashita: Heijou Unten Jinrui wa Suitai Shimashita: Mikakunin Seibutsu Special
Manga this work
Jinrui wa Suitai Shimashita: Nonbirishita Hōkoku this page
Jinrui wa Suitai Shimashita: Yōsei, Shimasu ka? Jinrui wa Suitai Shimashita: Nonbirishita Hōkoku 4-koma
Anime sibling adaptation
Humanity Has Declined Humanity Has Declined Specials 6 ep

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4 revisions View all
  1. r4 source · import Imported from AniList +1 field 4 weeks ago
  2. r3 source · import Imported from AniList +1 field 4 weeks ago
  3. r2 source · import Imported from AniList ±3 fields Oct 2026

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