Demon Slayer started from a comic book, and it expanded various things. Anime started in 2019, and the movie started in 2020 as the “Mugen train” version. In addition, a smartphone app started in 2020, and a home video game is going to start in 2021. Furthermore, there is a stage of the orchestra which performs with pictures of the story of Demon Slayer. In the summer of 2021, the stage of Demon Slayer is going to be held.