Goku Day is observed worldwide every May 9, celebrating Son Goku, the main protagonist of the Dragon Ball media franchise. This holiday, officially recognized by the Japanese Anniversary Association, was chosen because the date can be read as "Go" (5) and "Ku" (9) in Japanese. Goku, created by Akira Toriyama, first appeared in the one-shot manga Dragon Boy before evolving into the serialized Dragon Ball, which follows his adventures in martial arts and the quest for magical Dragon Balls. The franchise has expanded into multiple anime series, films, video games, and more, making Goku an iconic character in manga and anime. Bird Studio, the producer of Dragon Ball, supports and promotes Goku Day through various events and promotions for fans.