Naruto: Chronicles of A Fire Ninja

"The reason you can't learn chakra flow is that a normal sword resists the flow of chakra. It's a minor nuisance with other elemental chakra, which can be overcome by flowing more chakra into the sword. However, with fire chakra, the resistance causes the sword to start melting due to the excess heat produced by the fire chakra."

"So, Sensei, you don't use chakra flow in your kenjutsu?" Kaida asked.

"No, I do use chakra flow in my fights, but as I said, normal swords can't handle fire chakra. That's why I use a special sword," Yukihiro explained, taking out his sword.

"This sword is made of chakra metal. It's more expensive than gold due to its special properties—it doesn't restrict chakra flow at all; in fact, it aids it. I had to complete many life-threatening missions to afford this, but it was worth it," Yukihiro said, a hint of pride in his voice.

"But Sensei, what is so different about chakra metal compared to normal metal?" Kaida asked, genuinely curious.

"Swords made of chakra metal contain chakra veins, which help the chakra flow through the sword—something normal metal swords lack."

Hearing this, Kaida remembered something. He could easily transform into another person or animal with chakra veins, so if he could transform into animals with chakra veins, why not transform into a chakra metal sword with chakra veins?

"Sensei, can you please give me that sword?" Kaida asked.

Seeing no problem with the request, Yukihiro handed his sword to Kaida. Kaida took the sword and passed his chakra through it. It was just normal chakra, but he was surprised by how easily it flowed through the sword.

Then, he made a shadow clone, which transformed into a sword. Yukihiro saw this and smiled—Kaida wasn't the first to try this. Many other ninjas had tried and failed. The Transformation Jutsu may form a sword, but it can't replicate the chakra veins. Yukihiro decided to explain this to Kaida.

"Kaida, it's not possible to replicate a chakra metal sword with the Transformation Jutsu. Many have tried before…" But just as he was in the middle of explaining, Kaida picked up the transformed sword. When he passed his chakra through it, a smile formed on his face. He handed the sword to Yukihiro.

Not understanding why Kaida was doing this, Yukihiro took the sword and asked, "Why are you giving me this sword?" Displeasure was apparent in his voice, as Kaida had not listened to his explanation.

"Sensei, please try to flow your chakra through the sword," Kaida said, the smile never fading from his face.

Puzzled by Kaida's actions, Yukihiro still decided to flow his chakra into the sword.

"Huh?"

He couldn't form the words. He even disrupted his chakra to confirm he wasn't in a genjutsu, but the result was just as unbelievable.

A chakra metal sword costs millions of Ryu—the amount a ninja earns after completing many S-rank missions, each time risking their life. Even then, the Hokage himself has to commission a sword to get one. And Kaida just made a sword in one second. How could he believe this?

Yukihiro looked at Kaida and then back at the sword in his hand. He passed his chakra through it again, and the result was the same. This time, he passed fire chakra into the sword, and once again, it behaved like a sword made of chakra metal.

He continued to flow his fire chakra into the sword, even increasing the input to see if it would be destroyed, but the sword held up—no matter how much fire chakra he channeled into it, it didn't melt, just like any chakra metal sword.

He then sliced the same boulder again and again, and the sword held up. Yukihiro returned the sword to Kaida and looked up at the sky.

"Fuck you," he muttered, cursing his luck. He had to suffer so much to get his sword, but the boy in front of him could get one practically for free. And not just one—Kaida was a walking factory of chakra metal weapons, able to make them anytime he wanted. To say Yukihiro wasn't jealous would be a lie.

He looked at Kaida and said, "We are going to meet Lord Hokage."

Kaida, seeing Yukihiro's reaction, said nothing.

After 30 minutes, two swords were placed on Hiruzen's table.

"Can anyone at least explain to me what happened?" Hiruzen asked. Seeing Yukihiro's sullen face was new, even for him.

"Please flow your chakra into both of these swords, Lord Hokage."

Hiruzen did as asked, but he didn't find anything wrong with the swords, except that one was leaking a little chakra—unusual, but nothing too big to disturb him like this. But then he remembered that Yukihiro only had a single chakra metal sword.

"Yukihiro, where did you get this second chakra metal sword?"

With a firm expression, Yukihiro replied, "Hokage, I would like to discuss this in private."

Hiruzen nodded and waved his hand, and suddenly four ANBU ninjas left his office, closing the door behind them. Hiruzen activated a silence seal so that their discussion couldn't be overheard by anyone else.

Yukihiro then looked at Kaida and said, "Kaida, disperse your clone."

*Poof*

Immediately, one of the swords on Hiruzen's table disappeared. Hiruzen wasn't an idiot—far from it. He quickly understood what had happened. He had been surprised when he first saw Kaida transform into animals with well-defined chakra veins. But this was different. Even though these swords would disperse in 10-24 hours, depending on how much chakra a clone was made of, and couldn't be given to a ninja for a mission that might take weeks to complete, during a time of war, Kaida alone could change the direction of the conflict with this ability.

"This will be a secret, and you are not allowed to share it with anyone else," Hiruzen said in a serious tone.

Kaida didn't understand at first why they were making such a big deal out of it. Seeing his confusion, Hiruzen chuckled and said, "Kaida, our village has 3,000 ninjas right now, and 1,000 of them use weapons in their fights. How many do you think have a weapon made of chakra metal?"

Kaida thought for a moment, considering how expensive chakra metal was. "Maybe around 100 or so?"

"No, only 12 ninjas have weapons made of chakra metal. Now tell me, how many weapons can you make that work the same as chakra metal weapons?"

Kaida paused for a moment, understanding the implications of Hiruzen's words. Then he said, "24."

"Right. You alone can increase Konoha's strength many times over in a war. Now, what do you think other villages would do if they heard about this?"

Kaida quickly understood why Hiruzen had said to keep it a secret. "I understand, Grandpa. I will keep it a secret."

Hiruzen nodded and ordered them to return to their training.

Hiruzen had initially considered reading Kaida's memories to check if he was hiding anything, but he quickly discarded the thought. Reading memories could be dangerous and cause mental harm. Kaida had now become too valuable to risk losing such a powerful card.

*****

((A.N.): Hey, if you liked this new theory I came up with, please leave a comment. Or if you have any doubts or problems with it, I'm open for discussion ^~^)