Unfortunately, Rengoku succumbed to Akaza, the Upper Rank Three demon, after initially almost defeating him. While this death is undoubtedly one of Demon Slayer's most tragic, it also happens for some crucial and impactful reasons.
Akaza is a major antagonist in the manga/anime series Demon Slayer: Kimetsu no Yaiba. He is a demon serving directly under Muzan Kibutsuji, and currently holds the position of Upper Rank Three of the Twelve Kizuki.
Kyojuro Rengoku vs Akaza was a battle that took place outside the destroyed Mugen Train. It focuses on the battle between the Flame Hashira Kyojuro Rengoku against Upper Rank Three Akaza.
Rengoku was able to hold off an Upper Moon 3 Akaza and even managed to get him desperate towards the end. Every aspect of Rengoku's combat abilities seem to be better than Tengen's. However, he would put up a good fight as it will not be an easy victory for Rengoku.
At the end of the day, none of the Hashira could've defeated Akaza – even though a few of them could've succeeded in decapitating him. Akaza proved himself to be too strong to be dragged into sunlight, meaning there'd be no way for any of the Hashira to kill him.
After awakening his demon slayer mark, Giyu greatly overpowers Akaza. However, he is able to keep up with the fight only because of Tanjiro. If Giyu had soloed against Akaza, he would have died.
In conclusion, Nezuko cannot beat Akaza in Demon Slayer. In terms of power, physical abilities, regeneration rate and overall combat ability, Akaza is far superior compared to Nezuko.
1. Gyomei Himejima. Gyomei Himejima, the Stone Hashira, is the strongest Hashira in the Demon Slayer corps in terms of strength and swordsmanship. He is the only person who uses spiked flails and an axe instead of standard swords to kill demons.
Akaza. Because of his desire to become stronger and Doma's strength allowing him to surpass himself to become Upper Two, Akaza harboured an intense hatred of Doma.
In that quick moment of Inosuke's attack, next panel shows both Akaza's arm were cut, as well as Rengoku's sword (which was stuck in his neck), and so he escaped from the impending dawn.
Shizuka is seen often teasing Sanemi and making him annoyed, nevertheless, the two had still created a strong bond and relationship with each other. Eventually, after knowing each other for a while, Shizuka finally ended up having the courage and confessed, leading to them getting married after awhile.
He would be disoriented by the shockwaves created by Akaza's blows. Tengen has anti-demon bombs that can disorient them for a short period of time, but this wouldn't be an effective strategy when Akaza uses Compass Needle, which allows him to accurately pinpoint and aim for his opponent's weak spots.
But, when it comes to who was the better Hashira, Tengen wins by a considerable margin. His experiences as a shinobi and as a Demon Slayer far exceeded Rengoku's, and led to him developing far superior strength, battle tactics, and techniques.
History. Doma was born with beautiful and rare rainbow colored eyes. Because of this unusual trait, his parents thought that he was able to hear the voices of God and was groomed to be the religious leader of the Eternal Paradise Cult, a position that he held until his death.
Is this because Akaza was formerly the Upper Moon 2 and Doma stole his position by requesting a blood battle with him? Because Akaza has lived longer than Doma.
After Akaza's death, Doma says that he felt as if the Upper Rank had turned into a different creature before he died, and that his demise is inevitable because he never ate any women. Doma begins to cry over his 'best friend's' death, but Kanao just tells him to stop with the lies.
Despite being a blood-thristy demon who has murdered several people, he has a set of principles he adheres to. One thing that Demon Slayer fans have noticed is that Akaza refuses to eat or kill women. Additionally, the Demon King, Muzan, gave Akaza special permission to do so.
Akaza was also one of Muzan's favorite demons out of all his subordinates. The reason behind this is Akaza's extreme loyalty to his master. The Upper Rank Three demon was always sent away on special missions, something the Upper Rank 1 and 2 were often denied of.
1 Muzan Kibutsuji
The Demon King Muzan Kibutsuji has seven hearts and five brains, making him one of the most intelligent characters in the Demon Slayer anime series.
8 Shinobu Kocho, The Insect Hashira
That being said, she's arguably the weakest Hashira when it comes to pure strength.
Demon Slayer's Tengen Uzui is considered to be one of the weakest Hashira due to almost losing this fight, but the fact is that Tengen only looks weak when compared to the most overpowered Hashira.
Since Tanjiro accessed the See Through World and achieved the Selfless State, he was shown to have effortlessly decapitated Akaza.
Akaza could not detect his fighting spirit via the compass and Tanjiro manages to decapitate Akaza with the Hinokami Kagura: Setting Sun Transformation.
Akaza wanted to make Rengoku a demon so that they could fight for hundreds of years, so that they can both continue to grow stronger. Akaza genuinely admired Rengoku's strength, and was impressed with his skills. Despite that, he knew that Rengoku wouldn't realistically be able to defeat him as a human.