Konoha Training Ground Six.
At this moment, Aoki Yoru, Kenta, and Yui had gathered here for the first time in a long while.
Looking at the familiar surroundings, Aoki Yoru couldn't help but sigh, "The last time we were here must have been when Kakashi-sensei was teaching us Ninjutsu. Two years have passed in the blink of an eye; time flies!"
Yui looked at the familiar training ground, a flash of nostalgia in her eyes, and said softly, "Indeed. We owe our current achievements to Kakashi-sensei's patient guidance. Two years have brought so many changes."
Kenta nodded in agreement. If he hadn't met Kakashi, a Ninja from a civilian background like him might still be a Genin who only knew Taijutsu and one or two D-rank Ninjutsu, or perhaps he would have already died in the war.
"Alright, let's exchange our insights on the Seven-Day Breathing Technique now," Aoki Yoru interrupted their thoughts.
They had come here today because of the breathing technique Kenta had proposed during their last gathering, to see if it was possible to incorporate Chakra nature into it.
If feasible, they would be able to unleash combat power far exceeding their usual levels in a short time using this breathing technique, instantly pushing their speed, strength, and defense to their peak.
Hearing this, Kenta and Yui looked at Aoki Yoru with burning eyes, their faces full of anticipation.
If there was anyone among the three of them most likely to develop it, it was this teammate before them. His comprehension was despairingly high; the two of them had to use all their strength just to barely keep up with his pace and not be left too far behind.
Aoki Yoru looked at his two teammates' gazes, shook his head helplessly, and sat down on a rock.
"Kenta has already explained the cultivation method in detail. The core of the Seven-Day Breathing Technique is to use a special breathing pattern to push lung capacity to the limit, using massive amounts of oxygen to activate all the cells in the body, thereby skyrocketing strength and speed."
"Its advantage is that it doesn't rely on Chakra or open the meridians, so it doesn't harm the body at all. However, its upper limit isn't as high as the Eight Gates."
"Also, the human body has limits. In extreme cases, there might be lung overload or bone damage caused by the body's own power overload. But this isn't a side effect of the technique itself; it's the result of the user forcing an overdraft. The technique itself is safe."
Kenta and Yui nodded upon hearing this; they had felt this way while practicing recently.
At this moment, Yui spoke up, "After exploring this for a few days, I think it should rely on a fixed breathing rhythm to drive Chakra to circulate along with the breathing, making the body and Chakra completely synchronized to unleash stronger power. I just haven't figured out how to integrate the Chakra nature into it yet."
Aoki Yoru nodded in agreement. Yui had hit the nail on the head; this girl was indeed a person of extraordinary comprehension.
He just didn't know why she hadn't made a name for herself in the original story. Could it be that she was wiped out when encountering a powerful enemy, similar to the bandit suppression mission last time?
That was actually quite possible. Kenta was a commoner; without a good teacher, his talent for Taijutsu would never be discovered. Yui, coming from a small clan, at least had family Ninjutsu, but she might have been killed before she could grow up.
He then said, "Yui is right. Going a step further, it means letting the nature-infused Chakra permeate the entire body's cells along with the breath. Every breath stores energy, and every move carries the power of the nature, just like completely integrating Ninjutsu into Taijutsu."
As he spoke, Aoki Yoru picked up a twig and started drawing on the ground, breaking down how breathing runs within the body, how Chakra and breathing synchronize, and finally, how the two fuse together, explaining it to them step by step.
The more Kenta and Yui listened, the brighter their eyes became. Their previous confusion dissipated, and their eyes burst with the brilliance of sudden realization. They stared fixedly at the breakdown diagram on the ground, feeling as if their train of thought had been completely cleared, and even their breathing became a bit hurried.
"Alright, everyone give it a try and see if it works." Aoki Yoru dropped the twig in his hand and clapped his hands.
The theory Aoki Yoru had conceived might end up looking a bit like Demon Slayer from his previous life.
He couldn't help it; whenever Kenta mentioned a breathing technique, he thought of that. The impression was just too deep, and after deduction, it was actually feasible.
One could only say that Chakra was truly a versatile energy; as long as one's imagination was big enough, any kind of ability could be reproduced.
Afterwards, Aoki Yoru walked to a corner and began to experiment. Although it worked in theory, whether it would succeed in practice was another matter.
"Swish, swish—"
Just as they were training, two figures appeared in the training ground.
After seeing the two figures clearly, Aoki Yoru was stunned for a moment, then stepped forward to greet them, "Kakashi-sensei, Sasuke, I didn't expect you to come here too."
Kakashi was also surprised that the three of them were at the training ground; this place shouldn't be of much use to them anymore.
"How did you three think of coming here?"
Aoki Yoru immediately explained the situation, including his ideas about the breathing technique.
Kakashi's expression gradually became serious. After a long while, he nodded, "According to your theory, it is indeed feasible."
Sasuke, standing on the side, widened his eyes upon hearing Aoki Yoru's theory, his gaze growing brighter and brighter.
After being soundly beaten by Uchiha Itachi last time, Sasuke realized his own weakness and powerlessness. Facing his enemy, he couldn't even put up a fight.
For the past few years, he had been lost in the praise of being the so-called top student. This time, he had been completely awakened, and he urgently needed to improve his strength.
Sasuke had asked Kakashi how to achieve a qualitative improvement, and Kakashi had laid out his own experiences and insights, admitting that if he could step into Sage Mode, his strength would see a true leap.
However, he had been trying to comprehend it for half a month and hadn't realized anything, leaving him feeling a bit disheartened. He had dragged Kakashi here to train out of frustration, not expecting such a harvest.
"Yoru-senpai, Yui-senpai, Kenta-senpai, please teach me the breathing technique." Sasuke bowed deeply to the three of them.
Aoki Yoru looked at Sasuke, knowing he had been provoked by Uchiha Itachi. Anyone who had been training desperately for years, only to realize they still couldn't see the depth of their enemy's power, would have their mental state collapse.
He walked up and patted Sasuke on the shoulder, "Sasuke, if Jiraiya-sama hadn't arrived in time this time, do you know what the result would have been?"
"I would have been killed by him, and no one would ever avenge the Uchiha Clan again." Sasuke raised his head, saying with an unwilling expression.
Aoki Yoru shook his head, "No, that's not the most important thing."
Sasuke looked at him in astonishment. That wasn't the most important thing?
"The most important thing is that your Uchiha Clan would have ended with you; there would be no more Uchiha Clan in the Ninja World!"
Sasuke's pupils shrank upon hearing this, and he showed a look of horror. Aoki Yoru's words had touched the softest part of his heart.
"So, Sasuke, before you go for revenge in the future, at least have a child first." As Aoki Yoru said this, a meaningful smile appeared on his lips.
At this moment, Kakashi leaned closer to him and whispered, "Your words sound very reasonable, but why do I feel like this is your twisted sense of humor?"
Aoki Yoru shrugged, "Just tell me if it makes sense or not."