This post has a spoiler for Demon Anime and manga
summarize
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Kokushibo is the strongest demon after Muzan came in. Demon Slayer Afraid of even the rest of the upper moon
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Backstory of the upper moon Infinity Castle Will reveal his jealousy about Yoriichi, his strongest brother Demon–
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Kokushibo became a demon to escape the death of the Slayer Devil, but still unable to beat Yoriichi.
Urgent link
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Kokushibo may get a spotlight in seconds. Infinity Castle movies
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It will be a unique fight.
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The first movie of Demon Slayer: Infinity Castle Arck is approaching the drama and the fans are eager to see the final fight between Demonic And the upper moon unfold Infinity CastleWhich will cover the three movies, there will be many fighting Which includes the battle between Tanjiro and Akaza and of course Shinobu and Doma; That is just the beginning, even though the warriors of humanity are against Muzan.
That was said Infinity Castle Will not be driven by the action only because the curves will dive into the story Three parts series show the brightness on the background of powerful moon, including Akaza.

Relevant
Demon Slayer Infinity Castle will present a great battle of Tanjiro with the third rank.
The first part of Demon Slayer Infinity Castle will present the fighting against Tanjiro and Akaza. This is all you need to know about this.
The importance of Kokushibo in the matter of Demon
He is the strongest demon after Muzan.
Kokushibo may not appear in at Demon A lot of anime, but he It is very important in this matter.– The warriors of humanity have fought for the demonic race for centuries and Kokushibo is the strongest demon that has been alive after Muzan. Demon Alive. Gyomei Himejima can beat this monster. Until now, the anime series has only exhibited a few times with the upper moon. However, these fights are more than enough for us to taste the strength of the upper moon in the way. These upper moon fighting has set the best fighting with Kukushibo.Because he was the one who sat on the top
Kukushibo, or the number one, became a demon after being troops to be a king, Mousan, as a human being. Kokushibo is a skillful swordsman. Demon So you can say that he becomes a scary demon immediately after turning back. Unbelievably powerful breathing techniques– Of course, Muzan is strong, but it is Kokushibo, who killed the leader of Demon Slayer Corps at that time.
That's not like that because Muzan is afraid of the breath of the sun after meeting Yoriichi. It is Kokushibo that helps Muzan to kill everyone. Demon Who uses breathing style? Therefore, it is safe to say that it is a Kokushibo that helps MUZAN to dominate humans and demonic killer in the Sengoku era.
The position of Kokushibo, as an upper Moon One, is still protesting.
Upper moon ranking in Demon Not permanent because the demon is higher after increasing strength. For example, Doma is the highest six centuries ago. But after becoming more powerful, he rises to the second position. However, no one can challenge the power of Kokushibo. He has become a devil about four centuries ago and all the time. He was forgotten. Demonic– Even the rest of the upper moon is afraid of the strength of Kokushibo.
The connection of the upper moon and the strongest Demon Used to live
Kokushibo is Yoriichi's brother.
Since Tanjiro joined Demon The group heard the name of Yoriichi many times. Yoriichi is the strongest. Demon Used to live In fact, he is Humans only have the most fearful humans. The former Yoriichi's past is closely linked to Kokushibo because they are brothers. Kokushibo is Yoriichi's brother, and in reality it is Kokushibo, which was inspired by Yoriichi for the first time.
Yoriichi has no desire to be a swordsman. It is Kokushibo's dream. Yoriichi likes to see his brother practice with a sword, so he unlocks his true potential after Kokushibo inspired Kokushibo. Began to develop the breath of the sun before he was ten years old, the jealousy of Kokushibo continues to grow.
I will stop your blood However, if you have bleeding until death … or if his rule disagrees with you … and you die … Death is always your fate in this case … You don't have a greater man than that, you don't … agree? – Kokushibo
However, the boy separated after the mother's death, and while Kokushibo became the Yoriicho family, it became Demon Slayer They may walk on different paths. But their fate is in the same direction– Therefore, brothers and sisters have come together after many years and instead feel happy to meet his younger brother. Kokushibo is becoming more jealous because the fact that Yoriichi became the strongest person. Demon– That is when Kokushibo decided to leave the family behind and practice with his brother as a friend. Demon– But what is it? Despite all working hard work, Kokushibo cannot overcome Yoriichi's natural ability, even the development of Moon Breathing cannot change anything for Kokushibo.
Fear of death forced Kokushibo to become a demon.
Just like Yoriichi Kokushibo is still developed. Demon Mark, which some people might think it is good to increase Kokushibo's confidence, but that's not the way Kokushibo knows this. In fact, it is something that makes Muzan's proposal to become a demon. Clearly, Everyone who develops files Demon Mark will die at the age of twenty five years.– That is the curse of the mark and Kokushibo cannot accept this fate because he wants to grow even more. So he decided to be a demon after all.
Kokushibo didn't become Demon Because of his love for humanity He is not interested in saving humans. He joins Demon Slayer Corps so that he can exceed Yoriichi from Kokushibo's perspective. Being a demon will not only But helped him from the curse But also helps him stronger than his brother But when many years later Kokushibo meet with YoriichiHe knows that his brother is still stronger than he is a demon. Not only that, but Yoriichi is still alive at the age of twenty -five years.– You can say that Kokushibo became a monster without anything and he realized the same thing in his final moment in Infinity Castle Arc
Kokushibo may get a spotlight in seconds. Infinity Castle movies
It will be a unique fight.
first time Demon Slayer Infinity Castle The movie is possible. Presenting fighting with Akaza, Doma and Kaigaku Therefore, we can expect Hashiras to gather with Kokushibo in the second movie before we reach Muzan in the third movie and the final battle of Kokushibo is one of the best fights that we see in Demon Anime
Will take more time Stone Hashira's effort to eliminate this beast. In addition to the order of the story of the origin of the upper moon, one is one of the most impressive parts of the movie. He spent many years as a demon and let his true identity go. But in the end, he will realize that there is nothing and the fans will shed tears during the time. Kokushibo is aware of this in the movie.