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How Did Muzan Find Out That Nezuko Is Immune to Sunlight?

In the world of anime and manga, “Demon Slayer: Kimetsu no Yaiba” has captured the hearts of fans worldwide with its captivating story and memorable characters. One of the intriguing aspects of the series is the unique abilities possessed by demons. In particular, the character Nezuko Kamado, the younger sister of the protagonist Tanjiro, possesses a remarkable ability to withstand sunlight, an attribute that plays a significant role in the narrative. This article delves into the storyline of how Muzan, the main antagonist of the series, discovered Nezuko’s immunity to sunlight, unraveling the secrets behind this intriguing plot point.

1. The Origins of Muzan Kibutsuji

To understand how Muzan discovered Nezuko’s immunity to sunlight, it is essential to first explore the origins of the main antagonist. Muzan Kibutsuji is the progenitor of demons in the series, and he possesses immense strength and numerous supernatural abilities. His main objective is to eliminate any threats to his existence, including Demon Slayers who seek to eradicate demons from the world. Muzan’s desire for power and survival fuels his relentless pursuit of dominance.

2. Muzan’s Encounter with Nezuko Kamado

During an encounter with Tanjiro Kamado, Muzan notices something peculiar about his sister, Nezuko. Despite being transformed into a demon, Nezuko does not suffer the same weakness as other demons when exposed to sunlight. This observation piques Muzan’s interest and sets the stage for his investigation into Nezuko’s unique ability.

3. The Scientific Curiosity of Muzan

Muzan possesses a profound scientific curiosity, which is evident in his quest for knowledge and experimentation. Fascinated by Nezuko’s immunity to sunlight, Muzan becomes determined to unravel the mysteries behind her exceptional trait. His desire to understand the underlying mechanisms of her ability drives him to undertake various experiments and investigations.

4. The Secret of Nezuko’s Immunity

In his pursuit of knowledge, Muzan delves into the intricate details of Nezuko’s transformation into a demon. He analyzes her blood and tissue samples, seeking answers that could provide insights into her immunity to sunlight. Muzan’s experiments involve subjecting Nezuko to different environments, exposing her to varying intensities of sunlight, and monitoring her reactions.

5. Discovering the Unique Blood Composition

Through his meticulous experimentation, Muzan uncovers a crucial aspect of Nezuko’s immunity. He determines that her blood possesses a distinct composition, which grants her the ability to withstand sunlight. This discovery marks a turning point in Muzan’s pursuit of ultimate power, as he realizes the potential significance of Nezuko’s blood for his own survival and invincibility.

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6. Muzan’s Desperate Hunt for Nezuko

Upon learning about Nezuko’s immunity to sunlight, Muzan becomes obsessed with capturing her. He views her as a valuable resource, a means to further enhance his demonic powers and transcend the limitations that other demons face. Muzan’s relentless pursuit of Nezuko becomes a central driving force in the series, as he spares no effort in his attempts to secure her.

7. The Importance of Nezuko’s Blood for Muzan’s Survival

As the story progresses, it becomes apparent that Nezuko’s blood holds immense value for Muzan’s survival. Her unique blood composition presents a potential remedy for his own weaknesses and vulnerabilities. Muzan believes that by consuming Nezuko’s blood, he can attain invulnerability to sunlight and become an unstoppable force.

8. The Climactic Showdown

The narrative reaches its climax when Tanjiro and his allies confront Muzan in an epic battle. With Nezuko’s immunity to sunlight playing a pivotal role, the conflict escalates into a life-or-death struggle. Muzan’s obsession with obtaining Nezuko’s blood drives him to make reckless decisions, leading to a dramatic conclusion that will have lasting consequences for the characters and the world they inhabit.


The discovery of Nezuko Kamado’s immunity to sunlight marks a significant turning point in the “Demon Slayer: Kimetsu no Yaiba” series. Muzan Kibutsuji’s scientific curiosity and relentless pursuit of power drive him to unravel the secrets behind Nezuko’s unique ability. His desperate hunt for her blood becomes a central conflict, shaping the course of the story and culminating in a climactic showdown. The intricate plot surrounding Nezuko’s immunity to sunlight adds depth and intrigue to the series, capturing the imagination of fans worldwide.


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