"Akaza was talking to Muzan and he was on his knees while talking with Muzan, it seemed he failed a mission and was about to get a punisment..."

"But...Muzan had a soft spot for Akaza and only made Akaza spit some blood out from his mouth...After that Akaza went to the infinity castle and sat down...he was taking a break..."

"He was known as the demon martial artists, Akaza."