National Anime Day is observed worldwide every April 15, celebrating Japanese animation, which constitutes over half of all animated television shows produced globally. The origins of this unofficial holiday are unclear, with some attributing its inception to the first Comiket convention in Tokyo in 1975, though there is no solid evidence to support this claim. On this day, fans engage in various activities such as re-watching favorite anime series, discovering new titles, cosplaying as beloved characters, purchasing merchandise, hosting anime-themed parties, and attending conventions. The development of anime began in the early 20th century, influenced by traditional Japanese art forms and techniques learned from Western animation. Today, Japan boasts over 430 anime production companies, contributing to a multi-billion dollar industry and a vast global fandom. The celebration of National Anime Day allows fans to connect and share their passion for anime through social media, using the hashtag #NationalAnimeDay.