The globally acclaimed anime film, ‘Demon Slayer: Infinity Castle – Chapter 1: Akaza Returns,’ is causing quite a stir. As anticipated, it’s been praised for its smooth animation, intense battles, and emotional depth. Before the movie graces US theaters in September, let’s remember the Flame Hashira, Rengoku Kyojuro, who valiantly perished battling Akaza.
Rengoku Kyojuro holds a significant and cherished position among Demon Slayer enthusiasts. His absence is deeply felt within the narrative, yet his influence remains ever-present. Despite lacking the demon slayer mark, Rengoku showed immense power during the Mugen Train arc when he bravely fought Akaza. Presently, fans are left pondering the reason behind Rengoku Kyojuro’s failure to activate his demon slayer mark.
Rengoku Kyojuro Is One of the Strongest Hashira
Rengoku Kyojuro Nearly Restrained Akaza
- Rengoku Kyojuro is a model Hashira.
- Rengoku Kyojuro is a strong swordsman.
Rengoku Kyojuro, known as the Flame Hashira, is renowned for being among the most powerful Hashiras of his era. His peers admire him not only for his exceptional swordsmanship and command over every aspect of Flame Breathing, but also for his remarkable mental fortitude. Even Akaza, Upper Moon Three, was so impressed by Rengoku Kyojuro’s combat skills and superhuman strength that he attempted to persuade him to renounce his humanity and become a demon.
In the Mugen Train storyline, Kyojuro Rengoku demonstrates the essence of a formidable Demon Slayer. Even against an incredibly powerful Upper Moon demon like Akaza, he maintains an unwavering strength, showcasing the ironclad determination to safeguard not only Tanjiro but also Zenitsu and Inosuke. Each swing of his sword embodies both immense might and the fervent zeal of his indomitable spirit.

In his dying moments, Rengoku Kyojuro stubbornly resisted allowing Akaza to achieve complete victory. With an unyielding force of willpower, he fought back with all his might, giving every ounce of energy until his final breath, determined to protect others from Akaza’s harm. The extraordinary display of strength by Rengoku Kyojuro during the Mugen Train Arc is especially awe-inspiring given that he had not yet unlocked the Demon Slayer Mark.
Rengoku Kyojuro Did Not Awaken the Demon Slayer Mark
The Timing to Awaken the Mark Is Off

Sanemi Shinazugawa, the Wind Pillar, considered activating the Demon Slayer Mark an easy feat; however, the truth is that it necessitated extraordinary situations and came close to proving fatal. During Akaza’s battle with Rengoku, no Demon Slayer bearing the mark was present, thereby preventing Rengoku from accessing its power, despite his remarkable demonstration of strength during the Mugen Train Arc.
To put it simply, for Rengoku to activate the Demon Slayer mark, a Sun Breather like Tanjiro needed to have activated their own Demon Slayer mark first. This would allow other Demon Slayers, such as Rengoku, to manifest their Demon Slayer mark. However, during Rengoku’s battle with Akaza, Tanjiro hadn’t yet awakened his mark, which is why Rengoku couldn’t activate his.

If Tanjiro had activated the Demon Slayer Mark during the Mugen Train Arc, it might have triggered Rengoku to awaken his own mark too. Given Rengoku’s fiery dedication towards protecting his companions and his unwavering loyalty to his Hashira responsibilities, he likely would have found no obstacles in activating the mark. The Demon Slayer Mark could have proved instrumental in Rengoku’s battle against Akaza.
Rengoku Kyojuro Could Have Awakened the Demon Slayer Mark
He Has Boundless Fighting Spirit Enough to Awaken the Mark

To this day, fans continue to mourn the passing of Rengoku Kyojuro during the Mugen Train Arc. It’s not hard to see why some fans speculate about how strong Rengoku might have become with the Demon Slayer mark if he were still among us. Had Rengoku survived the Mugen Train arc, it is possible that he could have undergone the same circumstances as Giyu Tomioka in order to awaken his own demon slayer mark, similar to what happened at the Infinity Castle.
Set your heart ablaze.—Rengoku Kyojuro
Contemplate the ferocity of the upcoming duel between Rengoku and Akaza within Infinity Castle. Both combatants will exceed their physical capacities, with Rengoku possibly unleashing his demon slayer mark, while Akaza will unleash his full destructive might until the end. This confrontation would undoubtedly be ranked among the most spectacular battles in Demon Slayer’s Infinity Castle storyline, promising an exhilarating and explosive spectacle.
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2025-09-01 17:38