The following contains spoilers from the Demon Slayer: Kimetsu no Yaiba manga and anime.
Demon Slayer: Infinity Castle trilogy is expected to adapt some of the most intense battles in the series so far. Each of these breathtaking showdowns will significantly influence the ongoing conflict between Muzan and the Demon Slayer Corps. While all of the combatants will push past their limits, some will discover that their fighting prowess exceeds their own estimations.
In the battle against Kokushibo, Gyomei, Sanemi, Muichiro, and Genya will join hands to bring down the Upper Rank One. Among them, one demon slayer will be a clear standout, and his swordsmanship will even force Kokushibo to admit that he is exceptional. But who is this demon slayer, and what makes him exceptional?

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A Hashira is Set to Impress Kokushibo in the Final Battle
In the Infinity Castle, the Demon Slayer Corps is all set to fight Muzan’s underlings before they can get to the Demon King. So far, demon slayers have typically fought an Upper Moon in groups, with the only exception being Muichiro, who defeated Gyokko all alone. But things are about to get more intense as Akaza, Kokushibo, and Doma finally reveal their true powers.
I know how unfair the world is… because good people… die one after another. ~ Sanemi Shinazugawa
Interestingly, the official Demon Slayer Infinity Castle trailer only gave a glimpse of Doma and Akaza’s adversaries, while Kokushibo was nowhere to be seen. However, the Upper Rank One is going to have the most exciting battle in the arc. As mentioned earlier, he will single-handedly fight Genya, Sanemi, Gyomei, and Muichiro. Despite being outnumbered by some of the most talented swordsmen of this generation, he will still overwhelm the four brave combatants on several occasions, proving why he is rated so highly by Muzan.
In all the chaos, one demon slayer will impress Kokushibo with his brilliant swordsmanship and extraordinary physique. That warrior is none other than the ruthless Wind Hashira. Sanemi Shinazugawa will arrive at the scene after Kokushibo has incapacitated Muichiro Tokito and attacked Genya savagely. The horrifying injuries of his brother will ignite a fire in Wind Hashira’s heart, pushing him to go beyond his physical limits. His form, timing, and brilliant moves will play out exactly as he desires.
Kokushibo, being mindful like always, will look closely at his fighting technique and point out that his physical abilities have peaked. The Upper Moon will also be just as surprised by Sanemi’s techniques and admit that he is perhaps one of the best swordsmen he has ever faced. Despite his grave injuries, Sanemi will outfox and surprise the Upper Rank One on a few occasions. Kokushibo will even mention how Shinazugawa’s mastery of Wind Breathing reminds him of the first Wind Hashira from the Sengoku Era.
Sanemi’s swordsmanship stands out not just because of his skills but also his indomitable will. He is a tough individual who can fight in spite of his grave injuries. That’s exactly what will happen in battle with Kokushibo as well. Shinazugawa will be seriously injured but will brave his wounds to continue fighting the Upper Moon as if nothing ever happened. His movements and sword work will be quick and fluid. The precision of each attack will not go unnoticed, and Kokushibo would find himself overwhelmed by his swordsmanship on quite a few occasions.
What Makes Shinazugawa’s Swordsmanship So Effective?
Sanemi Shinazugawa excels at fighting at a relentless pace that is hard to keep up with. It should not surprise anyone that even someone like Kokushibo, who has refined his swordsmanship for centuries, feels that the Wind Hashira is exceptional. While speed, endurance, and indomitable will play a crucial role in his excellence with the sword, the primary source of his greatness is his mastery of Wind breathing.

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Wind Hashira Sanemi became obsessed with mastering his breathing style soon after learning it. His drive for perfection eventually paid off as he became one of the best swordsmen of his generation. As if his incredible use of his swordsmanship style and ruthless approach to fighting is already not impressive enough, things will get even more exciting once he awakens his Demon Slayer Mark.
The mysterious marking will give Sanemi access to the Bright Red Nichirin Sword, which significantly slows down a demon’s regenerative capabilities. Kokushibo will have to deal with the threat Shinazugawa poses while simultaneously fighting Gyomei, Genya, and Muichiro. Wind Hashira’s attacks will not be as impactful initially, but will slowly make Upper Moon One seem defeatable. Sanemi’s incredible swordsmanship will leave an unerasable mark in history and cement his legacy forever.
Demon Slayer: Infinity Castle trilogy’s first installment is scheduled to be released in the United States on September 12, 2025.
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