The 'Humanity Has Declined Opening Parody', also known as the 'Declination Dance', originates from the opening sequence of the 2012 anime Jinrui wa Suitai Shimashita. The dance features the protagonist, Watashi, and several small fairies performing a rhythmic, synchronized arm-swinging motion to the song 'Real World' by nano.RIPE. Its infectious and slightly bizarre choreography quickly became a favorite for fan animators, leading to countless parodies where characters from different franchises are inserted into the sequence. The meme captures the show's unique blend of colorful aesthetics and cynical, post-apocalyptic humor, often used to represent collective participation in something absurd or the joyful acceptance of a social or cultural 'decline.'