The anime series "Demon Slayer: Kimetsu no Yaiba" first premiered in April 2019. The manga, which the anime is based on, was serialized from February 2016 to May 2020. In addition to the original anime series, there have been several movies and seasons released afterward, including the sequel film "Demon Slayer: Kimetsu no Yaiba – The Movie: Mugen Train" in October 2020 and the film trilogy "Infinity Castle" starting in July 2025, with the first part released in Japan on July 18, 2025. So, the original "Demon Slayer" anime was made and released in 2019, while the manga began earlier in 2016.