In the ninja world, there was a class of ninja tools known as Kusanagi swords.
They referred to blades that had reached the pinnacle in some particular aspect. Orochimaru's Sword of the Gathering Clouds of Heaven, Uchiha Itachi's spiritual weapon, the Totsuka Blade, and Sasuke's straight sword were all Kusanagi swords.
Over the past few years, Uchiha Sora had completed his own enhancements, so naturally, he had not forgotten to upgrade his equipment.
Ryuzuki was a treasured blade forged in the same batch as the White Fang's tantō. Its strength was already more than sufficient for an ordinary jonin.
But as Uchiha Sora grew stronger, the enemies he faced would only become more powerful.
Ryuzuki's durability was becoming a concern.
According to the information he had gathered, among the famous Kusanagi swords of the ninja world, aside from those passed down since ancient times, all the others had been forged by the Snowmoon Family of the Land of Iron.
They were the finest family of swordsmiths.
Mifune had previously mentioned that Chosuke, the man who had given him Ryuzuki, came from the Snowmoon Family.
Sora sought out Chosuke and asked to return Ryuzuki to him, so they could forge a Kusanagi sword-level weapon for him—essentially trading in the old for the new.
Chosuke was deeply dissatisfied. He broke into a fierce argument with Uchiha Sora, berating him for his heartless abandonment.
Fed up with the noise, Uchiha Sora infused Ryuzuki with chakra right in front of him. The heat was so intense that Ryuzuki was nearly melted!
It can't withstand me. You understand now, right?
Chosuke fell silent for a while, then asked Uchiha Sora to wait as he went back to consult his elders.
"We can reforge Ryuzuki using the rarest chakra metal."
"No one is more