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Jinrui wa Suitai Shimashita: Nonbirishita Hōkoku
人類は衰退しました のんびりした報告 · じんるい わ すいたいしました のんびりした ほうこく
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
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...
Source: AniList
External databases: MADB · Wikidata · AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections
Volumes
IKKI COMIX First edition
1vols · 2012-08
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AURA 魔竜院光牙最後の闘い
2012 · 星野倖一郎, 田中ロミオ · 4vols · Shōnen
ComedyRom-ComSchoolRomanceSupernatural
人類は衰退しました
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ミサイルとプランクトン
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SchoolRomance
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うるわし怪盗アリス
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ComedyMysterySupernatural
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6のトリガー
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Sci-FiActionAssassins
Wonderland Museum
WONDERLAND MUSEUM
2012 · 浦山慎也 · 2vols · Shōnen
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アポカリプスの砦
2012 · 蔵石ユウ, イナベカズ · 10vols · Shōnen
Sci-FiActionGoreSurvivalZombies
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カプリッチョ
2012 · 藤谷むっく · 3vols · Shōnen
Sci-Fi
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ひとりぼっちの地球侵略
2012 · 小川麻衣子 · 15vols · Shōnen
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二ノ前しいの使い方
2012 · 猫砂一平 · 3vols · Shōnen
Sci-FiEcchiComedySchool