One of the moments underestimated in Hashira training will have tremendous results in Infinity Castle Arc.

summation

• Zenitsu changes after learning the cruel death of the mentor and preparing for a violent fight with his old gangster.

• KUWAJIMA's Seppuku develops into a mysterious letter, and Agatsuma requires revenge for Kaigaku.

• The upcoming cruel battles of Zenitsu with Kaigaku form a war with Muzan to promise extensive results.

Devil Slayer Hashira Training Arc focuses on events developed after Nezuko conquered the sun, and two moons died in the village of Swordssmith. As the immortality of the devil king Muzan Kibutsuji gets closer, the Devil Slayer Corps prepares an existential battle that can define the future of humanity.

The arc focuses on several central events, including the Hashira Conference led by Amane Ubuyashiki, the background of Gyomei, the cracking between the shinazugawa brothers, and the constant pursuit of the Devil Slay Mark. But one of the small scenes that most fans may have overlooked has a much greater impact on future events than anything else. It will not only change one of the devil slayers, but also affect intense battle in the devil slayer.

Zenitsu and mysterious letters

Agatsuma learns the terrible destiny of the mentor

• Japanese cartoon film: Episode 62 titled “Stone Hashira Gyomei Himejima”

Since Zenitsu Agatsuma debuted, he has been terrible and cowardly. He is dramatically improved as a fighter, but his hero remains a result of his subconscious programming and constant training under the cautious eyes of Jigoro Kuwajima. Even in Hashira Training Arc, Zenitsu constantly complains about unnecessary annoying and harsh training.

Zenitz, perfect! It's okay to cry or leave alone. Never give up. Believe yourself. You have endured all hell training. I will be compensated for it. Try to forge yourself like a reinforced blade … Be the most elastic one of everything! Focus on doing your best! ~ Jigoro Kuwajima Zenitsu Agatsuma

Everything changes when you receive a mysterious letter while training in Stone hashira Gyomei Himejima. The scene at that time doesn't look so serious. In fact, Zenitsu is busy with ordinary joke and hides the ominous characteristics of the message he will receive.

Agatsuma found out that his mentor and former Thunder hashira Jigoro Kuwajima committed Seppuku. Just as this is not already terrible enough, Zenitsu also finds that it was too hard to cut the mentor's head, so the process was long and painful. At his last moment, Ku and Jima endured unimaginable pain and the pain he had to go through.

The butterfly effect of the letter is delivered to Zenitsu.

Zenitsu was transformed into a fighter with Jigoro's death.

Zenitsu was naturally heartbreaking after learning about the passing of Kuwajima. But instead of falling into despair, even his close friends had an unexpected change that surprised him. Agatsuma stopped complaining about training or conversation with others. Instead, he was isolated and focused on the goals he set for him.

Interestingly, the letter mentioned that Kuwajima committed Seppuku after finding out that one of his disciples, Kaigaku, became a devil. This turned out to be an unbearable burden, and I thought it was desirable to live with a shameful betrayal of Thunder. Kaigaku continued to replace Gyutaro and Daki with New Upper Moon Six.

A few years ago, when Zenitsu was trained by Jigoro, Kaigaku used it to mock him. So when he realized that the same gang was responsible for the death of the only person who believed in him, AgatsuMa was of course terrible. Unlike harassment, Zenitsu knew that this time could not forgive Kaigaku and sweared the exact revenge.

Until you died, you did not lose. You can rub your face in the soil, lose home or drink mud … People can curse you to steal money … But as long as you live … you can win someday. You will win. I went forward with that faith. ~ Kaigaku

DEMON Slayer: Infinity Castle Trilogy will focus on the entire war between DEMON Slayer Corps and Muzan. Most hashira and other devil slayers will fight in groups, but Zenitsu will only face his arched kaigaku. Due to the feeling of revenge and sadness, Agatsuma will push his old gangster to find a sense of regret for his actions.

But Kaigaku, who lived a life led by self -preservation, would not shed a tear to the old mentor who led him when he was most needed by his old mentor. Jigoro's cruel death and inconspicuous legitimacy will lead to Zenitsu and pushing beyond his tolerance and cruel battle. Most fans are excited about the fight with Akaza, Doma and Kokuscheibo of the Infinity Castle Trilogy, but the battle with Kaigaku is also very interesting. It will form a war with Muzan Kibutsuji and will have extensive results.

Devil Slayer: The first installment of Infinity Castle Trilogy will be released in the United States. September 12, 2025.