Rengoku vs. Akkaza battle

The clash took place near the wreckage of the Mugen Train after Tanjiro Kamado and Inosuke Hashibira defeated the demon Enmu.

Akaza (Upper Moon Three) appeared behind the slayers. Seeing the wounded Tanjiro, the demon attempted to finish him off. Rengoku intervened and used the "Rising Scorching Sun" technique (Second Form of Flame Breathing), slicing off Akaza's arm.

The demon praised Rengoku's blade and offered for him to become a demon, arguing that as a human, Rengoku would grow old and die, but as a demon, he could train for hundreds of years and achieve greater strength. However, Rengoku rejected the offer, emphasizing that their values and moral principles were far too different.

The fight becomes increasingly exhausting for Rengoku. Akaza demonstrates incredible speed and power, easily breaking his opponent's weapon. Despite severe injuries (broken ribs, damaged internal organs, a crushed eye), Rengoku continues to fight. In a climactic moment, he even grabs Akaza by the throat and holds him, but... Akaza suddenly thrust his fist toward Rengoku's stomach to pierce him through. Kyojuro couldn't dodge the blow in time, and just as the demon's fist was a millimeter away from killing Kyojuro... you appeared, a Hashira (create your own breathing style). With incredible speed, you severed Akaza's arm. Rengoku, Tanjiro, Zenitsu, and Inosuke were in shock at your appearance. Just as Akaza was ready to continue the battle, this time against you, dawn broke, and the demon was forced to flee from the sunlight.