Anime Demon Slayer: Kimetsu No Yaiba is nearing its conclusion, with the final chapter exploring the ultimate fate of the characters in the Infinity Castle. Fans are eagerly waiting to see what will happen to Tanjiro, Nezuko, and the main antagonist of the series, Kibutsuji Muzan.
The journey in Kimetsu No Yaiba begins with one of the most tragic events we’ve seen in anime history. Tanjiro, a dedicated young boy living with his siblings and mother, returns home one day to discover that his entire family has been slaughtered.
Tanjiro’s family members have fallen victim to a demon attack. The only survivor, his younger sister Nezuko, has been transformed into a demon herself.
Why Does Kibutsuji Muzan Target Tanjiro’s Family in Kimetsu No Yaiba?

From the very beginning of the story, we understand that the tragic fate of Tanjiro’s family is not just a random occurrence, as the demon’s actions are part of a broader, sinister plan. The events surrounding Tanjiro’s family are orchestrated by the primary antagonist of the series.
Tanjiro gradually learns many truths about what happened to his family. Muzan is not an invincible demon; he has vulnerabilities, including sensitivity to sunlight. Consequently, Muzan has to navigate life while seeking a cure for his own affliction. In doing so, he has inadvertently spilled a significant amount of his blood onto Tanjiro’s family members, intending to observe their evolution and see if anyone in Tanjiro’s bloodline could potentially resist the transformation.
Tanjiro’s siblings and mother have died, but Nezuko not only survives but also develops unique abilities that allow her to resist Muzan’s transformation process.
Nezuko’s Absence in the Initial Arc of the Infinity Castle in Kimetsu No Yaiba

To understand the rationale behind Nezuko’s absence, we must revisit the earlier arcs where Tanjiro’s sister exhibited extraordinary resistance to sunlight, making her a unique case among demons.
Kamado Nezuko remains a demon, so she is at risk of being harmed by sunlight. However, she has developed a remarkable ability to remain hidden from its rays, which makes her valuable to Muzan.
Therefore, the demon slayer group is reluctant to let Nezuko face Muzan directly, as he seeks to capture her to harness her unique abilities for his own purposes, potentially creating a perfect demon that could turn the tide in his favor.