(Spoilers!)Is Kokushibo Related to Tanjiro in Demon Slayer? Are they related by Blood?


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Is Kokushibo Related to Tanjiro:- In Demon Slayer anime, the characters Kokushibo and Tanjiro have grabbed fans’ attention. This makes people wonder: Are Tanjiro and Kokushibo related? The question involves more than lineage. It explores the complex histories, powers, and destinies woven into the story.

As we go through lore and speculation, let’s unravel the threads between these pivotal characters. Let’s see how their fates intertwine with legendary Yoriichi Tsugikuni, the most powerful Demon Slayer. We will demystify a big question in “Demon Slayer”: Is Kokushibo related to Tanjiro?

Spoiler Alert!!! This post will contain many spoilers as we will directly pick arcs and stories from Manga


Kokushibo’s Background

Kokushibo was once called Michikatsu Tsugikuni. He lived during Japan’s Sengoku era when there was a lot of war. He was born into a samurai family. He was a skilled swordsman and twin brother to Yoriichi. But he left his family(The reason is discussed below). He became a demon under Muzan Kibutsuji. As a demon, Kokushibo got unique abilities and created his own fighting style, Moon Breathing.

This was very different from Yoriichi’s Sun Breathing. He was known for his immense strength and a variety of powerful techniques that mimicked the shape of crescent moons. Though he seemed harsh, he respected worthy opponents. Deep down, he felt regret and fear about his choices. For example, he showed warmth to his descendant Muichiro Tokito.

Also read:- Does Nezuko Die in Season 4? Story of Nezuko in DS 4

Tanjiro’s Journey

Tanjiro Kamado’s story has tragedy and determination. After demons killed his family, only he and his sister Nezuko survived. But Nezuko became a demon. Tanjiro starts as a Demon Slayer to avenge his family and cure Nezuko. Unlike Kokushibo, Tanjiro didn’t start with a Demon Slayer Mark.


He earned it through a selfless act. His mark is like Yoriichi’s, who was friends with Tanjiro’s ancestor, Sumiyoshi. Throughout the series, Tanjiro masters the Breath of the Sun and becomes a strong demon slayer.

Is Kokushibo Related to Tanjiro in Demon Slayer?

Is Kokushibo Related to Tanjiro?

The story of “Demon Slayer” makes fans wonder about the connection between Kokushibo and Tanjiro. Their backgrounds and journeys help explain it. Kokushibo and Tanjiro in Demon Slayer are not directly related by blood, they both are related because of Yoriichi’s significant impact on their lives and the mark on their head. Let me explain to you properly how Upper Moon One Demon is related to Tanjiro Kamado

His Relation to Yoriichi and Is Kokushibo Related to Tanjiro?

Kokushibo was originally Michikatsu Tsugikuni. He was the twin of Yoriichi Tsugikuni, a legendary Demon Slayer. His journey began in the Sengoku era. Michikatsu became the demon Kokushibo(Upper Rank One demon) because after getting the mark, he was told he would die by age 25. Being afraid of dying young, he agrees to become a Demon and joins Muzan Kibutsuji.

Not only that, Kokushibo was also jealous of Yoriichi. This envy also made him abandon his human life to become a demon under Muzan Kibutsuji.

The bitterness toward his brother and the curse is not the only reason for becoming a demon. Muzan’s manipulation sent him down a destructive path to eventually become Upper Moon One.

Also Check:- Does Tanjiro Become a Demon? Unveiling Tanjiro’s Fate

Tanjiro’s Connection to the Tsugikuni Legacy

Tanjiro Kamado is on a quest to save his sister Nezuko and avenge his family. He and Kokushibo are not related by blood. But they connect through Yoriichi. Yoriichi was friends with Tanjiro’s ancestor Sumiyoshi. Sumiyoshi learned Sun Breathing from Yoriichi and passed it to the Kamado family. So there is an indirect tie between Yoriichi and Tanjiro. Kamado family preserved the Sun Breathing technique under the guise of the Dance of the Fire God(Japanese name as Hinokami Kagura)​​​​​​​​

Fans have theories about the similarities between Tanjiro and Kokushibo. Like their marks. But the marks came from different ways and not from blood relation. Kokushibo developed his mark as Michikatsu Tsugikuni, and it remained even after his transformation into a demon, while Tanjiro’s mark was a scar at first and later developed during his journey as a Demon Slayer

Tanjiro’s Hanafuda earrings link him to Yoriichi through friendship and legacy. Yoriichi gave them to Tanjiro’s ancestor Sumiyoshi with Sun Breathing knowledge that reached Tanjiro. So it’s a spiritual bond, not family.

Also Read:- Who Married Who in Demon Slayer | Demon Slayer Spouse Wiki

The Role of Yoriichi Tsugikuni and his connection with Tanjiro

The Role of Yoriichi Tsugikuni and his connection with Tanjiro

Yoriichi Tsugikuni is an important character in Demon Slayer. He was born with a special Demon Slayer Mark on his forehead. This gave him incredible abilities and made him a gifted warrior. Tanjiro Kamado got a similar mark during intense battles. This symbolized Tanjiro’s deep connection to the Demon Slayer legacy.

One of Yoriichi’s skills was using the red Nichirin sword. This blade could weaken demons’ healing powers. So Yoriichi was a formidable enemy. His sword left a permanent scar on Muzan, the main villain. This shows how effective it was.

Yoriichi pioneered the powerful Sun Breathing technique. He mastered it. Later, it was passed down to Tanjiro’s Kamado family as Hinokami Kagura. The adaptability of Sun Breathing made it lethal against demons.

Yoriichi suffered much tragedy, including his wife’s and unborn child’s murder by a demon. This impacted him deeply. He joined the Demon Slayers and quickly became a Hashira due to his unmatched skills. He even almost defeated Muzan, leaving the Demon terrified.

In his later years, Yoriichi was exiled after being stripped of Hashira status. This was partly due to his brother Kokushibo’s betrayal and Yoriichi’s failure to kill Muzan. His final fight was against Kokushibo. Despite being old and blind, Yoriichi showed his strength before dying unharmed.

Theories for “Is Kokushibo Related to Tanjiro in Demon Slayer?”

The connections between Yoriichi and Tanjiro have created lots of fan theories. One popular one is about their Demon Slayer marks. Some fans think the marks mean they’re related. Others see the marks as a symbol of their shared destiny against demons.

Let me tell you again, it’s important to know that Kokushibo and Tanjiro aren’t directly related. All of our research was based on Manga. So whatever is here written is based on Manga. Even if there are fan theories, the manga tells us that Yoriichi was friends with Tanjiro’s ancestor Sumiyoshi. Their similarities seem coincidental or related to Sun Breathing and the Mark. But Yoriichi’s influence on Tanjiro and the Slayers is still a key part of the story.


I hope you got the answer for the relation between Upper Moon One Demon and Tanjiro Kamado. Kokushibo and Tanjiro have some similarities like their Demon Slayer Marks and skills. But their life paths are very different. Kokushibo’s path has envy and regret. It leads him to become a demon. Tanjiro’s path has resilience and hope. He fights the demon forces.

Their connection isn’t family ties. It’s the shared history of the Demon Slayers and Yoriichi Tsugikuni’s legacy. This complex web of relationships makes Demon Slayer deeper. It shows how fate, choice, and legacy shape the characters’ destinies.

About Sourav Sahu

Sourav may be new to the anime world, but his experience in developing and ranking websites since 2020 has given him the necessary skills to manage our blog efficiently. Although Sourav is new to anime, he has watched a variety of animated content from different parts of the world, giving him a unique perspective on the anime world. He is constantly exploring new anime shows and manga series, bringing fresh ideas and opinions to our blog.

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