Which Movie to Watch Before Demon Slayer-Infinity Castle: Finally, after so much waiting, the highly anticipated “Demon Slayer: Infinity Castle” has been released, and it has already received a lot of love from the fans. There are so many anime seasons and movies that are already out, but which movie should you watch before watching Demon Slayer: Infinity Castle? Don’t worry; if you are also confused, then we will suggest the movies that you must watch before you watch Demon Slayer: Infinity Castle.
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Why the Mugen Train Movie is Essential
Mugen Train, which was released in 2021, is the first movie that you must watch before watching Demon Slayer: Infinity Castle. This movie takes us to the story of Tanjiro, Nezuko, Zenitsu, and Inosuke, and we see how they together board the mysterious train and encounter powerful demons. It is perfect, as it delivers emotional depth and the unforgettable Flame in the form of Hashira, Kyojuro Rengoku. It also introduces us to Akaza, who later becomes a crucial villain in Infinity Castle.
The battle between Rengoku and Akaza is iconic, and it perfectly sets up Akaza’s continued role in the upcoming trilogy. Viewers who have seen the Mugen Train movie will fully appreciate the weight of battle between Tanjiro and Giyu Tomioka as they later face Akaza in Infinity Castle.
Alternatives: Anime Arc vs. Movie
There is a huge debate among the fans about whether to watch the Mugen Train anime arc or the theatrical movie. But let us tell you that both the shows cover the same storyline, but the anime spreads it across seven episodes, and it has additional scenes and “Taisho Era Secrets”. The movie is a condensed form, as it tries to adjust the complete story into a gripping two-hour experience. The Mugen Train film should be on your list, especially if you are looking for quick preparation.
If you still ask yourself which movie to watch before watching Demon Slayer: Infinity Castle, we will suggest the Mugen Train film because it is efficient, emotional, and vital to the story.
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Swordsmith Village Arc Adds More Context

Moreover, viewers should also consider watching the anime’s third season in the form of the Swordsmith Village Arc. It is not a movie, but it introduces Upper Rank demons such as Doma, and it further develops Tanjiro’s abilities. This arc is worth watching after finishing Mugen Train, as it will give you a deeper understanding of the villains and Hashira.
To the Hashira Training Arc Leads Directly to Infinity Castle
The fourth season, which is named To the Hashira Training, will act as a perfect bridge into Infinity Castle. The final episode, “The Hashira Unite”, takes us to the scene where we see Muzan confronting the Demon Slayer Corps and later dragging them into the Infinity Castle itself. This arc tells us why all the Hashira and heroes are gathered together and why they are ready for the final battle.
Final Recommendation
So, to your question of which movie I should watch before watching Demon Slayer: Infinity Castle? We have a clear answer in the form of the Mugen Train movie. This movie will introduce you to critical villains, and it develops core characters that provide the emotional weight that is necessary for appreciating the upcoming trilogy.
Moreover, if you are someone who has time, then you should pair the Mugen Train movie with the Swordsmith Village Arc and the To the Hashira Training arc, as it will create the perfect preparation. However, for the people who have just two hours to watch Mugen Train, it is more than enough to enjoy the epic battles and emotional stakes of Infinity Castle.
Note
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