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Demon Slayer: Kimetsu no Yaiba is a Japanese anime television series based on Koyoharu Gotouge's manga series of the same name. At the end of the third season finale, a fourth season covering the manga's "Hashira Training" arc was announced. The fourth and final season, titled Demon Slayer: Kimetsu no Yaiba – Hashira Training Arc, adapts from the 15th and 16th volumes (chapters 128–139) of the manga. It premiered on May 12, 2024, with a one-hour episode. The season ended with a one-hour special, which aired on June 30 of the same year. Wikipedia