Warning: The following contains SPOILERS for Demon Slayer: Mugen Train
Kyojuro Rengoku's death was the heartbreaking climax of Demon Slayer: Mugen Train — but it was a death that had to happen. For both his and Tanjiro's characterization, as well as the plot of the Demon Slayer series, Rengoku had to make the ultimate sacrifice. His death leaves a major hole in the Demon Slayer Corps, but it serves to propel the storyline and the young demon slayers forward into the Entertainment District Arc and the upcoming Swordsmith Village Arc in Demon Slayer season 3. But why did this fan-favorite have to die?
As the Flame Hashira, Kyojuro Rengoku is one of the strongest members of Demon Slayer's core team. After years of dedicating himself to his craft, Rengoku worked his way to one of the most revered positions within the Corps, possessing incredible willpower and almost unbeatable swordsmanship. When the team needed a Hashira to lead Tanjiro, Zenitsu, Inosuke, and Nezuko in defeating the demon of the Mugen train, Rengoku was an obvious choice.
Related: Why Demon Slayer's Inosuke's Wears A Pig's Head
Rengoku's performance against the demons on the Mugen train in the Demon Slayer movie was impressive enough to draw admiration from even Inosuke, and Rengoku ensured that not one of the 200 passengers died. Unfortunately, Rengoku succumbed to Akaza, the Upper Rank Three demon, after initially almost defeating him. While this death is undoubtedly one of Demon Slayer's most tragic, it also happens for some crucial and impactful reasons.
It was a heartbreaking moment, but Rengoku's sacrifice in Demon Slayer made sense both for his character and for the movie's storyline. In Rengoku's mind, he is nothing more than a human who has worked
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