Jinrui wa Suitai Shimashita

In the light novel 'Jinrui wa Suitai Shimashita,' also known as 'Humanity Has Declined,' readers immerse themselves in a world where mankind is slowly fading away, leaving Earth in the care of intelligent 10-centimeter-tall fairies. The protagonist, an arbitrator between humans and fairies, navigates the complexities of her role upon returning to her hometown of Kusunoki. Initially thinking the job would be easy, she soon discovers the intricate challenges posed by her interactions with the fairies, making for an engaging blend of adventure, comedy, fantasy, and sci-fi within a slice-of-life setting.