If you are a fan of the popular manga and anime series Demon Slayer: Kimetsu no Yaiba, you might have wondered about the relationship between the main protagonist, Tanjiro Kamado, and the Upper Moon One demon, Kokushibo. Are they somehow related by blood? What is the connection between them and the legendary Sun Breathing user, Yoriichi Tsugikuni? In this article, we will answer these questions and reveal the truth behind Tanjiro’s ancestry.

Who is Tanjiro Kamado?

Tanjiro Kamado is a young boy who becomes a Demon Slayer after his family is slaughtered by Muzan Kibutsuji, the first and most powerful demon in existence. The only survivor of the massacre is his sister, Nezuko, who is turned into a demon by Muzan’s blood. Tanjiro vows to find a way to turn Nezuko back into a human and to avenge his family by killing Muzan.

Tanjiro is a kind-hearted and compassionate person who values human life and respects his enemies. He is also determined and courageous, willing to face any challenge or danger to protect his friends and allies. He possesses a keen sense of smell, which allows him to track down demons and detect their weaknesses. He also inherits a rare ability called the See-Through World, which enables him to perceive the flow of energy and movements of his opponents.

Tanjiro’s main fighting style is Water Breathing, one of the five main forms of breathing techniques that enhance the physical abilities of Demon Slayers. He learns this technique from his master, Sakonji Urokodaki, who is a former Water Hashira (Pillar). However, Tanjiro also has another breathing technique that he inherited from his father, Tanjuro Kamado. This technique is called Hinokami Kagura (Dance of the Fire God), which is later revealed to be a form of Sun Breathing, the original and most powerful breathing technique that was created by Yoriichi Tsugikuni.

Who is Kokushibo?

Kokushibo is one of the Twelve Kizuki (Demon Moons), the strongest subordinates of Muzan Kibutsuji. He holds the rank of Upper Moon One, which makes him the strongest among them. He has lived for over 400 years as a demon, and has mastered his own breathing technique called Moon Breathing, which is derived from Sun Breathing. He also possesses six eyes that grant him enhanced vision and perception.

Kokushibo was once a human named Michikatsu Tsugikuni, who was born during the Sengoku period (1467-1615) in Japan. He was the elder twin brother of Yoriichi Tsugikuni, who was born with a birthmark that signified his potential as a Sun Breathing user. Michikatsu was jealous of his brother’s talent and hated him for being favored by their father. He also felt inferior and insecure about his own abilities as a swordsman.

Michikatsu joined the Demon Slayer Corps along with Yoriichi, hoping to surpass him and become stronger. However, he soon realized that he could not match his brother’s skill or power, even after learning Moon Breathing from him. He also witnessed Yoriichi’s fight against Muzan Kibutsuji, where he almost killed the demon lord with his Sun Breathing. Michikatsu felt despair and resentment towards his brother, who had achieved everything he wanted.

Michikatsu eventually abandoned his family and his duty as a Demon Slayer, and became a demon by accepting Muzan’s blood. He changed his name to Kokushibo, meaning “starfall”, and dedicated himself to becoming stronger than Yoriichi. He also sought to create more Moon Breathing users by turning talented swordsmen into demons and teaching them his technique. However, he never succeeded in surpassing his brother or finding anyone who could match him.

Is Tanjiro Related to Kokushibo?

The answer is no. Tanjiro and Kokushibo do not have any direct blood relation. However, they do have an indirect connection through Yoriichi Tsugikuni.

Yoriichi was the ancestor of Sumiyoshi Kamado, who was Tanjiro’s great-great-grandfather. Sumiyoshi was a close friend of Yoriichi, who saved him from a demon attack when they were young. Sumiyoshi admired Yoriichi’s kindness and strength, and learned Sun Breathing from him. He also inherited Yoriichi’s earrings, which had the design of the sun.

Sumiyoshi passed down Sun Breathing and the earrings to his descendants, who eventually became the Kamado family. Tanjiro was the last heir of this lineage, and he inherited both the breathing technique and the earrings from his father, Tanjuro. Tanjiro also inherited Yoriichi’s birthmark, which activated when he fought against Akaza, the Upper Moon Three.

Therefore, Tanjiro is related to Yoriichi by blood, but not to Kokushibo. Kokushibo is Yoriichi’s twin brother, but they were not related by blood. This is because Yoriichi was a reincarnation of the first Sun Breathing user, who lived thousands of years ago. Yoriichi was born with the memories and abilities of his previous life, which made him different from his brother and other humans.


Tanjiro Kamado and Kokushibo are not related by blood, but they have an indirect connection through Yoriichi Tsugikuni, who was Kokushibo’s twin brother and Tanjiro’s ancestor. Tanjiro inherited Sun Breathing and a birthmark from Yoriichi, while Kokushibo learned Moon Breathing from him. Both of them sought to become stronger than Yoriichi, but in different ways. Tanjiro wanted to honor his legacy and protect humanity, while Kokushibo wanted to surpass him and dominate the world.

This article was written by Bing, based on information from various sources. According to Fiction Horizon, there is no direct relationship between Kokushibo and Tanjiro. According to Kimetsu no Yaiba Wiki, Tanjiro has a connection to Kokushibou’s brother, Yoriichi, but they were not related by blood. According to Fresherslive, Tanjiro is directly related to Sumiyoshi, who was a close friend and acquaintance of Yoriichi.

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