Demon Slayer Infinity Castle Arc will finally shed light on the most underrated Ubuyashiki character

Kiriya Ubuyashiki
Kiriya Ubuyashiki (Image Credits: Shueisha)

Demon Slayer consistently excels at blending thrilling battle sequences with deeply emotional and touching moments for viewers. The upcoming Infinity Castle Arc promises to elevate the series to an even greater level.

While viewers often focus on Tanjiro or the Hashira’s growth, other characters remain quieter, and their true importance has often been overlooked by many fans. Among them, Kiriya Ubuyashiki is one of the series’ most understated characters, arguably shouldering a far heavier burden than most could endure without breaking.

When talking about the House of Ubuyashiki, most fans immediately think of Kagaya, the calm yet perceptive leaderof the Demon Slayer Corps. Yet, after his dramatic death, this burden was passed to Kiriya Ubuyashiki, who was far younger than anyone expected could handle such a weighty task effectively. This arc captures the fragility and resilience of the family line—though their lives are short-lived, the Ubuyashikis are what bind the very structure threatening Muzan Kibutsuji. The Infinity Castle Arc is thus not just a series of battles that escalate into larger scales but also a revelation of how Kiriya is filling the shoes of his father when necessary.

The whole setting of Infinity Castle is symbolic in itself, an unsettled and shifting labyrinth that represents the uncertainty and messiness of war. It is in this anarchy that characters are compelled to demonstrate their inner thoughts, not only in battle but also in leadership, decisiveness, and sacrifice. This is an especially important arc for Kiriya Ubuyashiki. A supporting character thus far, he finally gets the opportunity to be in the spotlight. The decisions he makes, his levelheaded nature, and his command ultimately prove critical to the survival of the Demon Slayer Corps. His position does not necessarily involve wielding a sword on the battlefield, but without his leadership, the coordination of the Corps would have floundered in the face of Muzan’s overwhelming power.


Demon Slayer and the weight carried by Kiriya Ubuyashiki

It is not only the drama of the battles that makes Demon Slayer so compelling to viewers, but also how every seemingly trivial character bears the weight of the world. The presence of Kiriya is the realization of this concept. At a point in time when most children are relieved of their duties, he is required to command troops and make life-and-death decisions. He must also hold his head high as he bears the weight of a family curse.The Infinity Castle Arc presents the anime with an opportunity to underline this dynamic since power in Demon Slayer does not require one to wield Nichirin blades—it requires individuals who believe in what they are doing.

Kiriya Ubuyashiki’s storyline is as much about legacy as it is about duty. The genius and wisdom of Kagaya are passed down through the genetic code to his children. Yet, the focus on Kiriya demonstrates that the ideals of preceding generations need to be carried forward by the younger generation. His maturity, discipline, and near-angelic composure prove that he is more than a nominal leader; he is a leader shaped by tragedy but who still endures adversity. To those who might have simply considered him a minor background character, the Infinity Castle Arc is sure to alter their perceptions.

Kiriya dressed as a girl (Image Credits: Ufotable)
Kiriya dressed as a girl (Image Credits: Ufotable)

This is ultimately another reason why Demon Slayer is so successful. It does not dismiss the importance of the role played by every single character, no matter how minor it may seem. Kiriya Ubuyashiki has been the behind-the-scenes powerhouse of the Demon Slayer Corps since the very beginning, and the Infinity Castle Arc will finally illuminate his significance. Although the scenes of the struggle of the Hashira and Tanjiro will become the focus of attention, Kiriya’s role as the guiding force is equally important. His leadership guarantees the unification of their struggle against Muzan. In his absence, Corps leadership would have floundered at the time when they were needed most.


Finally, the Infinity Castle Arc is more than the actual confrontation between demons and humans. It is also an effort to highlight the characters in the shadows, such as Kiriya Ubuyashiki, who continues to remain steadfast. He is a hero, and his leadership and power testify that not every hero carries a sword—some lead others to do it. To viewers anticipating the anime to continue as much as possible, this arc will serve as an exclamation that even the most subtle characters can influence major events in Demon Slayer. Kiriya demonstrates that these characters can shape outcomes by regulating even the most significant conflicts.

Edited by Ritika Pal