Jinrui wa Suitai Shimashita, also known as Humanity Has Declined, is a whimsical and satirical anime series that explores a post-apocalyptic world where humans are in decline and fairies have become the dominant species. The protagonist, known simply as the Mediator, navigates this peculiar world filled with bizarre and humorous situations. The series is known for its unique storytelling and social commentary, blending fantasy with thought-provoking themes.