Upper Moon 1: The Story of Kokushibo (Powers And Abilities)

Upper moon 1

Yoriichi Tsugikuni, Kokushibo’s fairly young twin brother, was demonstrated to have a great deal of natural talent, and Kokushibo as a person fostered a great deal of envy for him.

He holds the most excellent rank, Upper-Rank One, among the demons connected to the Twelve Kizuki.

Kokushibo was just an average human named Michikatsu Tsugik, a retired Demon Slayer and the elder twin brother of Yoriichi Tsugikuni, the most powerful Demon Slayer ever, who lived in the Golden Age of Demon Slayers, approximately 5 generations earlier. Yoriichi was the greatest Demon Slayer to have ever lived.

The person who transformed Zenitsu Agatsuma’s senior, Kaigaku, into a demon and joined the Twelve Kizuki is Kokushibo, who is also Muichiro Tokito and Yuichiro Tokito’s ancestor.

The true strengths of the demon that comprise Twelve Kizuki are frequently demonstrated throughout the program. While battling the Flaming Hashira Kyojuro Rengoku, Akaza revealed his real nature at the time. Rengoku fought Akaza and died an upper-rank three demon, while Tengen Uzui almost died fighting Daki and Gyutaro, an upper-rank six creature.

This tends to make us ponder how powerful the highest level 1, Kokushibo’s, might be.

The upper-rank creatures in Demon Slayer are shown to be extremely powerful monsters. And the most powerful of them is still yet to appear in the film. But here’s what you need to learn about Kokushibo, the upper rank 1 demonic creature in Demon Slayer.


Kokushibo Appearance

Kokushibo’s body image resembles that of his twin brother, Yoriichi. He holds his long dark hair with red ends in a nice ponytail. Before his transformation, he seemed to be a regular person. His appearance altered drastically once he became a demon, with his face obscured with three pairs of yellow eyes and red sclerae, totaling six eyes, unlike other demons in the anime.

Kokushibo also bears Demon Slayer Markings on both the left and right sides of his jawline.

With his thick brows and noticeably paler skin, Kokushibo’s look as a human was nearly identical to his demonic form. As a human, he had dark purple eyeballs and white sclera. He wore a white kimono as a youngster rather than the purple-and-black striped one he wears now.

Kokushibo changed into a much more hideous and monstrous version after being decapitated by Gyomei Himejima and Sanemi Shinazugawa. He now had peeking canine teeth and mandibles, large white tusks on both the front and back of his head, sharp nails, red outgrowths on his face, his pupils staring in various directions, shortened and unkempt hair, several slender tubes sticking out of his body, and countless black and red scorpion tail-like projections.


Kokushibo Personality

As seen during the Upper-Rank assembly, Kokushibo was a steadfast adherent to the Twelve Kizuki rules. He showed an incredible feeling of allegiance to Muzan Kibutsuji, and the majority of his acts were taken with the express intention of achieving Muzan’s objectives.

Additionally, he has demonstrated a true relish for the task that the opponents he fought presented, as seen by the fact that he spared Akaza because he loved the challenge of fighting him and helped Muichiro Tokito bandage his severed hand.

He was a strict adherent to the rules, always on time, and very respectful of the Twelve Kizuki’s hierarchy. When he made mistakes, he would never complain but instead own up to them.

The early life of Kokushibo

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As a human, Kokushibo was deeply envious of his younger twin brother, Yoriichi Tsugikuni, who had extraordinary aptitude and abilities. Observing his brother aging into an elderly man despite using his Demon Slayer Mark made him feel even more resentful and spiteful. He still valued and cherished his brother, though, very much.

As a young child, Kokushibo developed intense envy for Yoriichi. He became aware of the high price he had sacrificed for the power he desperately wanted while fighting the Hashira. He turned out to be a hideous monster, far from his romanticized aim of rivaling his brother as the most formidable warrior.

He treasured the homemade flute Yoriichi had created for him as a youngster, and it was evident that Yoriichi’s act touched him. He afterward passed away with no memory of his origins.

Furthermore, his excessive ambition to surpass his brother is also manifested in the appearance of his six eyes, which allude to his desperate attempt to enter the Transparent World to overcome his sibling. Kokushibo cried sincere tears at his brother’s passing, and he even went so far as to retain the flute as a remembrance of his adored and despised younger brother for years to come.

He deeply mourned and regretted his life decisions after his passing.

How Kokushibo became a demon

Kokushibo became a demon

To activate his Demon Slayer Mark, which, in contrast to his twin’s, was located on both his temples and chin, he learned under his younger brother. There were conflicting feelings as he gained this mark; he had improved his talents but also picked up the curse that would end his life until he was 25.  He permitted himself to be a Demon and eternal since he was so frightened of dying.

He is currently one of the rare Demon Slayers who has ever turned evil and defected, according to knowledge. He did this while leaving behind a wife and two kids, but unlike many other new demons, he did not exterminate the last members of his family group.

Blood demon art

Kokushibo Blood Demon Art

Sanemi’s Blood Demon Art, which complements his fighting style of “Moon Breathing,” enables him to produce and control several razor-sharp blades in the form of conventional crescents from his flesh katana. Because the size, breadth, and pace of these crescent moon swords are continually shifting, Kokushibo’s attacks are incredibly unexpected because they follow no particular pattern.

He also actually manages to use his Blood Demon Art while his katana is drawn, giving him the ability to forge crescent moon swords without ever drawing his sword or performing a move. His Blood Demon Art is exceedingly difficult for Demon Slayers to avoid because of how unpredictable it is.

It appears that Kokushibo has a dual power to control the size and angle of his sword slashes through the practice of the Blood Demon Art. A reddish-orange crescent shape that bears his crescent moon swords is often created by his slashes and surrounds.

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To some extent, Kokushibo appears to be in command of these slashes, extending their range and changing their shape to hit his victim in ways that would be inconceivable under normal conditions.

His strikes became a faint purple tint as he bent his blade into its branch-like shape.


For the sake of his upper moon one position, Kokushibo has faced three challenges. Akaza took part in one of these conflicts. Kokushibo typically swallowed the demon he vanquished, but he relished the challenge and left Akaza alive.

The first Demon Slayer to turn into a demon is probably Kokushibo’s.

He changed into a demon in his early 20s and continued to exist as one for another 460+ years.

With 2938 votes, Kokushibo received the 14th-highest ranking in the second popularity poll.

Hopefully, you now know who upper moon 1 is and his powers. If you wish to inquire more, we are one call away! Comment below, and we’ll get back as soon as possible.

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