Initially perceived as the comedic relief in Demon Slayer, Zenitsu Agatsuma is one of the series’ main figures and a trusted ally of Tanjiro. While he often falters when faced with challenges, his character undergoes a remarkable evolution. In a dramatic turn during the Infinity Castle Arc, Zenitsu defies expectations by remaining conscious throughout his intense battle with Kaigaku.
Disclaimer: This article contains spoilers from the manga. All opinions expressed are those of the author.
Understanding Zenitsu’s Awakening During His Confrontation with Kaigaku
Zenitsu resonates deeply with audiences who grapple with anxiety and fear. Throughout the early sections of Demon Slayer, he often succumbs to panic during battles, relying on muscle memory to execute his signature technique, the Thunder Breathing: First Form—Kaminari no Ichi no Kata: Ichi Iga (Thunderclap and Flash). This form consistently proves effective, notably against foes like the Spider Demon (Son) on Mt. Natagumo and Daki during the Entertainment District Arc, showcasing his latent skills even while unconscious.
As the narrative progresses, Zenitsu begins to face his fears head-on, realizing he possesses the courage to fight for what he believes in, independent of his unconscious state. The Infinity Castle Arc is crucial for his character, marking a decisive moment when he boldly confronts Kaigaku, a former senior disciple, in their long-awaited showdown.
The Dynamics of Zenitsu and Kaigaku: A Tale of Rivalry
The backstory between Zenitsu and Kaigaku is layered, rooted in their training under Jigoro Kuwajima, the former Thunder Hashira. This rivalry was characterized by Kaigaku’s relentless ambition to be regarded as the only rightful successor. In contrast, Zenitsu, often feeling overshadowed, was emotionally vulnerable and idolized his counterpart.
The major turning point in their relationship occurs when Kaigaku encounters Kokushibo, the Upper-Rank One demon. Exercising a fateful decision, he forsakes his humanity in exchange for increased power by consuming Muzan’s blood, ultimately becoming a demon. This transformation leads him to ascend to the Upper-Rank Six position after Gyutaro’s demise, a decision that devastates Jigoro and drives him to despair.
The Climactic Confrontation in Infinity Castle
In Chapter 143 of the manga, Zenitsu feels Kaigaku’s presence within the Infinity Castle, igniting immediate hostility. With fiery emotions, Zenitsu confronts his former peer, lamenting Kaigaku’s loss of humanity and its dire repercussions, while Kaigaku, now devoid of human emotions, provokes him into battle.
Kaigaku’s demonic powers allow him to utilize rapid and fearsome lightning techniques fueled by Blood Demon Art. However, Zenitsu surprises everyone by staying awake, fighting with newfound tenacity. This moment signifies a radical shift in his growth as a Demon Slayer, demonstrating that he no longer relies entirely on instinctive reactions. Additionally, he unveils a new technique: Thunder Breathing: Seventh Form – Honoikazuchi no Kami (Flaming Thunder God), illustrating his evolution and mastery of the Thunder Breathing techniques.
Conclusion: Zenitsu’s Growth as a Hero
Zenitsu’s battle against Kaigaku is a pivotal testament to his character development throughout Demon Slayer. His determination to remain awake during this critical fight symbolizes his transformation from a cowardly youth to a courageous individual prepared to defend his ideals. As the fifth season progresses, viewers will likely witness Zenitsu’s journey alongside Tanjiro, Inosuke, and the Hashira in the Infinity Castle. Fans can anticipate a thrilling adaptation in an upcoming trilogy of films, further solidifying Zenitsu’s reputation as one of the most formidable users of Thunder Breathing.