He arrived at the Library and searched all four areas he was permitted to enter.

Surprisingly, he didn't find any scrolls he wanted. He thought to himself.

“This is too surprising. Does this mean they are kept in higher-level areas, or do they simply not offer this skill to ordinary Ninja?”

As he left the Library, he analyzed the situation again.

“Hmm, that might be it. However, injecting Chakra into weapons is not a big deal. If I recall correctly, many Ninja can do it. But in Konoha, I only remember Asuma being able to do this. Danzo also seems to be able to do it, just in a different way.”

Regardless, Feng Zheng wanted to try it himself. He thought Genshu or his friends might not know about this.

On his way back to the small forest, he considered various methods. His first thought was.

“I can try to make my Chakra flow through the kunai, just like when I was trying to cut leaves. Only, I won't try to cut the kunai, but rather try to make its edge sharper.”

Then he tried to implement this technique, but he encountered many difficulties in the process.

He immediately succeeded in what he wanted to do, as he was able to inject Chakra into his kunai on his first attempt.

However, the amount of Chakra injected was very low, and after two consecutive days of trying to inject more Chakra, there was not much improvement.

Moreover, while the sharpness and penetration of the kunai improved, the improvement was not significant, and there was no further improvement over these two days.

He thought to himself.

“This is truly painful! This seems like a dead end. I think a Chakra blade might help, but something feels off. If I keep going, maybe I'll make some progress, but it might take years. I should think of other ways.”

He thought for a few hours, and then an idea struck him. He decided to adopt a method similar to what was shown in Hunter x Hunter. He thought to himself.

“Yes, that's right. I can try a similar method to Hunter x Hunter. I'll first try to release my Chakra and cover my entire body with it. Then I'll try to extend this layer of Chakra to the kunai I'm holding.”

“Although this method is very inefficient, it should allow me to learn faster. Once I can do it, I can practice injecting Chakra directly into the kunai without covering my body.”

Covering the entire body with Chakra is not something any Ninja would willingly do.

The reason is simple—lack of Chakra. Doing so would quickly deplete the user's Chakra.

According to Feng Zheng's memory, besides the Jinchuriki, only Raikage's body was fully covered with Chakra.

Others would at most cover a part of their body or a weapon to enhance them.

Feng Zheng began to train in a new way. And it was very tiring. In just seven minutes, his Chakra was depleted.

However, he could see that he had made some progress in extending Chakra to the kunai.

He observed slow but steady growth within seven minutes.

He guessed that after about ten more attempts, he would be able to perfectly cover the kunai with Chakra.

However, since Chakra would be quickly depleted, he could only train about three or four times a day.

Not to mention, there was still a lot to do after covering the kunai with Chakra.

Feng Zheng didn't want to waste weeks on this, so he decided to buy soldier pills.

After a few hours of rest, he went home to get cash, then went out to buy the medicine.

He transformed in an alley and went to a shop that sold soldier pills.

soldier pills are very useful for Ninja.

He was somewhat surprised when he first read about them.

A high-quality soldier pill can provide about thirty times the Chakra of an ordinary Jonin.

It does not provide Chakra immediately, but rather a small portion of Chakra every hour, lasting for more than three days.

It also releases an enzyme that stimulates the Ninja to stay awake for three days. This is why people who take soldier pills can fight for three days straight.

Feng Zheng didn't know that there were actually even better soldier pills, but they were customized for top Ninja and not available to everyone.

Feng Zheng decided to buy medium-quality soldier pills. These are mainly used by Chunin.

Currently, Feng Zheng's own Chakra reserves are far higher than those of an average beginner Genin, possibly even stronger than an average Genin.

By next year, his Chakra reserves should grow to the same level as weaker Chunin school teachers.

Despite not yet having Chunin-level Chakra reserves, he decided to buy medium-quality soldier pills because his training was too strenuous.

He bought a total of five pills, which cost ten thousand Ryo.

The price indeed made his heart ache, but he was also glad he started learning Sealing Technique.

For the next three days, he continued his extensive training.

On the first day, he was able to cover his kunai with Chakra. Then he infused it with the wind attribute, which immediately affected the kunai's sharpness and penetration. The Chakra extended the kunai's attack range by five centimeters.

He tried out his new ability. He thought to himself.

“Great, I can cut branches as if I'm cutting through air. Although I can't cut down trees, that's because the kunai is too small. If I had a sword, this shouldn't be a problem.”

“The kunai can also penetrate deep into boulders. I remember Naruto and Asuma were able to penetrate a boulder in one of the fillings, so I can try that too. Honestly, if an enemy underestimates me and tries to block the kunai, he will be seriously injured.”

But Feng Zheng needed to reduce the amount of Chakra he used to do this.

The next part of the training should be to try to cover the kunai directly instead of covering his entire body... How should he do that?

Feng Zheng thought for a moment, then came to a conclusion.

“Trying to cover it directly might fail. Instead, I should first cover my hand with Chakra, and then try to extend it to the kunai. I think I can also train how to inject Chakra into my fist this way. Although not Tsunade-level, a Chakra-infused punch should completely surpass the power of an ordinary punch.”

Then he continued to try to cover only his fist with Chakra. It took him several hours to be able to do this. He thought to himself.

“Hmm, this isn't difficult.”

Then he tried to extend the Chakra to the kunai. Although he could extend it, the amount of Chakra that could now reach the kunai was much less. He thought to himself.

“I see, because I only coated my fist, the amount of Chakra I'm extending is much less. So basically, I have to concentrate more Chakra in my fist.”

Subsequently, he began to concentrate more Chakra in his fist.

This was much more difficult than expected. Doing this required extremely high Chakra control.

Fortunately, Feng Zheng had trained his Chakra control extensively.

It took another day for the Chakra he could condense in his fist to double.

He was not satisfied with the increased amount of Chakra and continued to try for more.

Soon, three days passed.

So he decided to hurry home.