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Unraveling the Mysteries of Kimetsu no Yaiba: An In-depth Analysis and

Kimetsu no Yaiba, also known as Demon Slayer, has been a phenomenon in the world of anime and manga. Its gripping storyline, captivating characters, and stunning visuals have won the hearts of millions worldwide. However, the series has left fans with numerous questions and theories that have yet to be answered. In this blog post, we will delve into some of the most intriguing theories surrounding Kimetsu no Yaiba, providing an in-depth analysis and insights into this beloved series.

The Dragon Form: The Ultimate Attack

One of the most common theories among fans is that the dragon form represents the ultimate attack in the series. This theory is based on the observation that most devastating attacks in the series take the form of a dragon. For instance, the Water Breathing Tenth Form: Constant Flux, a powerful attack used by the protagonist Tanjiro Kamado, manifests as a water dragon. Similarly, the Flame Breathing Ninth Form: Rengoku, a technique used by Kyojuro Rengoku, the Flame Hashira, also takes the form of a fire dragon.

Unraveling the Mysteries of Kimetsu no Yaiba: An In-depth Analysis and Insights

The dragon form is not only a symbol of power and destruction but also a representation of nobility and supremacy in Asian cultures. Therefore, it's plausible that the author, Koyoharu Gotouge, chose the dragon form as the ultimate attack to reflect these cultural values.

The Black Sword: A Symbol of Potential

Another intriguing theory revolves around the color of Tanjiro's sword. In the series, the color of a Demon Slayer's sword is determined by their Breathing Style. However, Tanjiro's sword is black, a color that does not correspond to any known Breathing Style. This has led to speculation that the black sword signifies Tanjiro's potential to master the original Breathing Style, the Sun Breathing.

The black sword could also symbolize Tanjiro's growth as a Demon Slayer. Starting as a novice with a black sword, Tanjiro gradually becomes a formidable Demon Slayer, with his sword changing color to red after coming into contact with Nezuko's blood demon art.

The Marked Ones: A Life Span of 25 Years

One of the most tragic aspects of Kimetsu no Yaiba is the short lifespan of the Marked Ones, Demon Slayers who bear a mark that grants them enhanced abilities. It is said that these individuals cannot live past the age of 25. However, there is a theory that this rule may not apply to those who have activated the original Breathing Style, the Sun Breathing. This theory is based on the fact that Yoriichi Tsugikuni, the original user of Sun Breathing and the only known Marked One to live past 25, was able to live for over 80 years.

The Existence of Demons: Not Completely Eradicated

Despite the defeat of Muzan Kibutsuji, the progenitor of all demons, it is theorized that demons may still exist in the world of Kimetsu no Yaiba. This theory is supported by the existence of Yushiro, a demon who survived the final battle and lived on in the modern era. It is also possible that other demons could have survived by hiding and avoiding conflict with Demon Slayers.

Urokodaki's Mask: Concealing Emotions

Sakonji Urokodaki, the former Water Hashira and Tanjiro's mentor, is known for always wearing a tengu mask. The reason behind this has been a subject

Urokodaki's Mask: Concealing Emotions

of speculation among fans. One theory suggests that Urokodaki wears the mask to hide his emotions, especially his compassion and empathy. As a former Hashira and a trainer of Demon Slayers, Urokodaki has to maintain a stern and strict demeanor to effectively train his students. His compassionate nature could potentially undermine his authority as a teacher. Therefore, the mask serves as a tool to conceal his true emotions and maintain his stern facade.

Nezuko's Resistance to Sunlight: A Result of Human Blood Abstinence

Nezuko Kamado, Tanjiro's younger sister and the only known demon to resist sunlight, is a unique character in the series. A prevalent theory suggests that Nezuko's resistance to sunlight could be due to her abstinence from consuming human blood. This theory is supported by the fact that Nezuko has never consumed human blood since she was turned into a demon. Instead, she was put under a hypnotic suggestion by Urokodaki to see all humans as her family and protect them.

Moreover, Nezuko is a descendant of the Sun Breathing user, which could have played a role in her unique resistance to sunlight. This theory, while not confirmed, provides a plausible explanation for Nezuko's unique abilities and her crucial role in the series.


Kimetsu no Yaiba is a series that invites speculation and theories due to its intricate plot and complex characters. While these theories provide possible explanations to some of the series' mysteries, they also highlight the depth and richness of the world created by Koyoharu Gotouge. As fans, we can only speculate and wait for official confirmations or revelations, either in the manga or in future anime adaptations.

Whether these theories hold true or not, they undoubtedly add another layer of intrigue to an already captivating series. They allow us to engage with the series on a deeper level, sparking discussions and debates among fans. After all, the beauty of any work of fiction lies not only in the story it tells but also in the conversations it inspires.

Disclaimer: The theories discussed in this blog post are based on fan speculations and are not confirmed by the official sources.


  • Kimetsu no Yaiba Manga by Koyoharu Gotouge
  • Kimetsu no Yaiba Anime by Ufotable


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