Konoha: Unable to learn ninjutsu, they had to develop their own.

Even if this knife is damaged, it can absorb blood and repair itself.

I was excited beyond measure every day.

"Kakashi-sensei, could I borrow it to study? Just for one day... no, seven days, one day is too short!"

He pleaded every day, clutching a large knife.

Kakashi was exasperated and quickly waved his hand, saying, "This was a gift for Chiba. It's not up to me. Go talk to Chiba."

"Yes, but it must be after the Chunin Exams."

Chiba's voice came from not far away.

Then, he jumped down from upstairs and landed in front of Kakashi and Tenten. On the other side, Kazusa also rushed over from the dojo.

It seems like the first group from before has gathered again.

Kakashi was momentarily dazed.

After a few seconds, he smiled and said, "You all seem to have grown quite a bit in just a few days."

"Of course!"

He smiled smugly every day, but kept his hand firmly on the knife.

After exchanging pleasantries, Tenten's sword was taken away by Chiba, and Kazusa was sent off to continue her training, leaving only Kakashi and Chiba.

Kakashi pulled out a booklet.

Chiba glanced at it; it described Kakashi's process and thought process in creating Breathing Vitality, and at the end, it described a complete technique and some conditions after its use.

Such detailed notes can be considered a textbook record of ninjutsu research.

He looked at it once and then put it away.

Immediately following, one breath in and one breath out.

After several cycles, Chiba's body cells were rapidly activated.

"..."

Kakashi opened his mouth, but in the end, he didn't say anything.

"Kakashi-sensei, thank you!"

"It's nothing. I learned a lot of techniques from you before, so it's only right that I help with the research. Besides, this technique was a great help."

Kakashi recounted his entire trip.

Then, Chiba realized how much influence he had had on the plot.

In their first encounter, Kakashi didn't use the "copy" tactic from the original story with Zabuza. Instead, he put on sunglasses to suppress the Sharingan's reading ability.

Then he drew his sword and used the weakened version of the original Raikiri in close combat.

After some probing, he had a basic understanding of Zabuza's strength, and then activated his Limit Break state, stimulating his Lightning Release chakra—

His speed increased dramatically in an instant, and he severely injured Zabuza with a single strike.

Haku then came to the rescue, but Kakashi, who still had energy left, did not give Haku face as he did in the original story, and his attitude was very firm.

Then came the fierce battle between the two sides.

Under the cover of Ice Release, the heavily injured Haku led the severely wounded Zabuza in a disheveled retreat.

however.

Zabuza's injuries are far more serious than before.

Zabuza's right arm was injured in a sneak attack by Kakashi. Later, Kakashi extracted Sage Chakra and used the even stronger Lightning Blade to protect Haku, which completely crippled Zabuza's right hand.

The consequences of the swordsman losing his right arm are self-evident.

Hearing this, Chiba's expression turned somewhat strange, and he asked, "Kakashi-sensei, what happened next?"

Zabuza was rendered useless.

Even if Bai is strong, he can't possibly leave with Zabuza.

Kakashi was silent for a few seconds, then sighed softly and said, "I chased after them, but in the end I let them go. That kid was too kind; I couldn't bear to kill him."

"How to say?"

"Even under those circumstances, he still didn't kill them. Naruto and Sasuke were seriously injured but not fatally. Zabuza, though he was ruthless in his words, ultimately used his right hand to block my Lightning Blade, which really touched me."

Kakashi sighed.

That scene reminded him of the past, and a flood of memories came rushing back.

He therefore let them go.

"Let them go, it's no big deal, you don't need to think too much about it."

Chiba looked at Kakashi, a thought flashing through his mind.

His mental attack technique is complete; all that's missing is a suitable "target" for testing.

no doubt.

Kakashi, who possesses the Sharingan, is the most suitable candidate.

If Kakashi hadn't returned, he planned to go find Inoichi, but it seemed there was no need for Inoichi now; he could just have Kakashi come directly.

"Teacher, I need your help."

"What's the deal?"

"I have developed a mental attack technique and would like to ask you to use your Sharingan to test the strength of my mental attack."

"..."

Mental attack technique?

Outrageous!

I'm just going out on a mission. Has your research field already ventured into such a dangerous area?

He was stunned for a moment.

Then, Kakashi took a deep breath, nodded, and said, "Okay."

He pushed up his headband, his crimson eyes flashing with tomoe, gathering his pupil power to prepare against mental attacks.

Chiba gathers spiritual energy.

Then, the two looked at each other—

Instantly, Kakashi's face turned pale, blood trickled from his left eye, and his eyes were filled with shock and pain.

The next moment, his magatama spun again.

The difference this time is that the rotation speed is faster than before, and the black magatama are gradually merging into one piece...

"Ugh!"

He covered his eyes and let out a painful groan.

"Kakashi-sensei?"

Chiba looked over cautiously.

But the next moment, Kakashi collapsed straight down.

Damn it? ?

That's not right, I clearly controlled my strength...

Damn it!

Kakashi, stop trying to scam me!

Chiba's eyes widened as he carried Kakashi on his back and ran towards the hospital.

Chapter 160 Seven-Day Breathing Technique, Chakra Circulation

"How could this be?"

Kitayama frowned. "He clearly doesn't have any injuries, and you yourself said that although his mental state is unstable, he isn't injured. How could he be unconscious?"

"do not know."

Chiba frowned.

Upon arriving at the hospital, after a thorough examination and with the aid of his sensory perception, he determined that Kakashi was not injured, but his mental state was slightly unstable.

This situation is very special.

He thought of a possibility.

Could it be that……

The mental collision between himself and Kakashi unintentionally activated Kakashi's Mangekyou Sharingan.

After all, Kakashi's eyes, like Obito's, had already opened when he was a child, but he just didn't know how to use them, so he always used the three-tomoe form.

"Without a certain amount of training, it's not necessarily possible to do it."

But respiratory activation techniques.

Because it was the first test, he didn't dare to use too much force and restrained most of his mental energy, so it was still somewhat different from actual combat.

"If that's the case, then Kakashi was just trying to scam us this time."

Also.

Chiba squinted, looking speechless.

The next moment, he tried to extract chakra and condense it in his lungs.

"Increase oxygen intake capacity."

numb!

I don't hit teachers, and this must be a misunderstanding!