Humanity has Declined

人類は衰退しました

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Quick answers

What kind of title is this?: Light Novel.
How many volumes are there?: 9 volumes are listed.
How many chapters are there?: 22 chapters are listed.

Synopsis

About Humanity has Declined

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...

Comedy Fantasy Sci-Fi