"Alright, let's begin our training!" Ignoring Sasuke, who was still deep in thought, Aoki Yoru continued with the next phase of training.
Even Kakashi, with a try-it-and-see attitude, began to explore this breathing technique to see if he could make any progress.
At his level, he had long passed the stage where conventional training could bring improvement; every step forward was as difficult as ascending to heaven. Originally, he had set his sights on the Eight Gates.
Might Guy had taught him the Eight Gates in the past, and he had even managed to open the first gate successfully. However, due to successive mental traumas, he had closed off his heart and sunk into despair, so he stopped practicing it.
During this period, he had been asking Might Guy for guidance, but unfortunately, perhaps because his talent for taijutsu was not high, he could only barely open the second gate, the Gate of Rest, even now.
He felt that he was not suited for the Eight Gates; opening the third gate afterward would be even more difficult.
He hadn't expected to find such a gain here—relying solely on breathing to provide the body with sufficient nutrients, thereby achieving a short burst of power.
If the addition of Chakra attributes, as envisioned by Aoki Yoru and the others, proved successful, then the magnitude of the temporary boost in strength would not be small.
Raiga from the Hidden Sand Village, huh? He truly is a taijutsu genius. It's a pity he was buried in the Hidden Sand Village; if he were in Konoha, Might Guy would surely be very happy.
Thinking of this, Kakashi began practicing the breathing technique with great enthusiasm.
At this moment, Aoki Yoru was sitting cross-legged on the ground, continuously inhaling and exhaling, trying his best to incorporate Lightning Release Chakra into it.
If an outsider were to look closely, they would notice his chest rising and falling steadily with the rhythm of his breathing.
With every inhalation and exhalation, the expelled breath carried wisps of fine lightning, like a breeze charged with electricity, leaving fleeting, pale blue light trails in the air.
As he continued his breathing, with every exhale, fine sparks of lightning escaped along with his breath.
The pale blue electric light grew brighter and brighter, circulating around his body in rhythm with his breathing, and fine trails of light gradually appeared in the air.
After a long while, Aoki Yoru stopped his breathing exercise and suddenly stood up.
The others who were sitting quietly also opened their eyes and looked at him in confusion, wondering what he was about to do.
Aoki Yoru shifted his center of gravity to his right leg, slightly bent his knee, and arched his back tautly. He held his sword at his waist with his right hand, the blade held diagonally, and his left leg lightly tapped the ground; he looked like a fully drawn bow.
He took a deep breath, and the air was instantly drawn into his lungs, emitting a faint whistling sound. In the instant he exhaled, wisps of silver-blue lightning sprayed out with his breath, crackling and exploding in the air, causing even the surrounding airflow to tremble.
The moment his toes slammed into the ground, a low rumble of thunder exploded from beneath his feet.
"Crackle—!"
His entire body was enveloped in blinding blue light, transforming into a straight bolt of lightning that tore through the air, leaving behind only a trail of flickering electric current, with even the sound left trailing behind.
In just an instant, Aoki Yoru's figure appeared in the woods dozens of meters away.
"Boom—"
The trees along his path were all sliced in half at the waist, crashing heavily to the ground.
Kakashi and the others stared at Aoki Yoru, dumbfounded, unable to speak for a long time.
"So fast!"
This was the collective thought of everyone.
"He really is a freak!" they couldn't help but exclaim immediately after.
They were all still in the exploratory stage, yet he was already able to execute it. Although he wasn't very proficient yet, it was only a matter of time.
Afterwards, they became excited; Aoki Yoru had actually succeeded, which proved that this path was viable.
Kakashi was the first to recover, rubbing his chin. "Even I would be killed in an instant by that speed if caught unprepared. It seems this technique has high growth potential."
Sasuke's eyes erupted with a scorching light, staring fixedly at Aoki Yoru, filled with longing.
"I must learn it. As long as I learn it, my strength will grow explosively, and then I can kill Uchiha Itachi."
"Hmm! My speed has increased by at least fifty percent in my normal state, and if I unleash my full power, it will at least double." Aoki Yoru nodded in satisfaction.
At his level, every bit of improvement in strength was extremely difficult; this could already be considered quite explosive.
For example, if he were to use the Body Flicker Technique combined with the breathing technique at full power now, he could definitely kill Danzo before he could react—of course, excluding Izanagi.
Such an increase in strength was already a qualitative change. As far as he knew, apart from the Eight Gates, no other Ninjutsu had such an effect, and furthermore, the Eight Gates had severe aftereffects.
As for the name of the move, Aoki Yoru couldn't be bothered to think of one.
"Let's call it Thunder Breathing, First Form: Thunder Flash!"
He thought of Zenitsu Agatsuma from Demon Slayer. He had always thought this move of his was very cool, especially when he used it while fast asleep; it was simply overflowing with charisma.
The next step was to replicate the other five forms of the Thunder Breathing style from Demon Slayer.
It wasn't that he was too lazy to develop new moves, but that the moves of Thunder Breathing were already perfect enough and extremely practical.
The techniques of the Thunder Breathing style were originally perfected by his disciples under the guidance of Yoriichi Tsugikuni.
To be honest, although the power level of Naruto was more than a notch higher than Demon Slayer, in terms of swordsmanship techniques, it was not necessarily superior to Yoriichi Tsugikuni, the strongest swordsmanship master in Demon Slayer.
In his past life, he had wondered if Yoriichi Tsugikuni came to the Naruto world, would he use a 'Heaven-Slicing Sword-Drawing Technique' on Uchiha Madara?
Afterwards, Aoki Yoru shook his head, threw the thoughts out of his mind, and walked toward the training ground.
Then, he saw everyone staring at him with burning gazes, especially Sasuke, whose eyes were practically glowing; he looked like a hungry wolf eyeing fresh meat, his eyes filled with undisguised greed and excitement.
"Aoki Yoru-senpai, please teach me." Sasuke was the first to step forward and bow deeply.
Then, he looked at Aoki Yoru with a hopeful expression. He also had the Lightning attribute, and this move would be a huge boost for him.
For him right now, as long as he could increase his strength, any condition would be acceptable, even selling his own soul.
"Sure. Kakashi-sensei, Kenta, and Yui, you can come over and listen too. You might gain some insights."
Aoki Yoru had no intention of keeping his techniques to himself; they were all Kakashi's students, and there was no need to hide anything.
Upon hearing this, everyone immediately gathered around, their eyes filled with anticipation.
With someone like Aoki Yoru, who had already gone through the process, teaching them step-by-step, it would undoubtedly help them skip countless detours of trial and error.
Sasuke, unable to contain his excitement, was the first to crowd in close. He activated his Sharingan and began taking notes with pen and paper, afraid of missing any detail.
Aoki Yoru didn't beat around the bush; he got straight to the core of the matter.
"The key to this move is to use the rhythm of the breathing technique to 'pump' the Lightning Release Chakra along with your breathing."
He demonstrated by adjusting his breathing, which suddenly sped up to the operating frequency of the Seven Days Breathing Technique.
"When inhaling, the Lightning Release sinks into the Dantian along the expanding airways and is compressed together with your breath."
"When exhaling, it flows along your tensed muscles like an electric current through a wire, spreading throughout your limbs, coating the blade with Chakra, and exploding outward."
Before he had even finished speaking, the lightning sparks leaping from his fingertips wrapped around the hilt of his sword in rhythm with his breathing, instantly crawling across the entire blade.
"It's that simple—the breathing is the 'engine,' and the Lightning Release is the 'fuel.' Once the two align, every slash you deliver will carry the speed and power of thunder."
Everyone listened with great interest, especially Kakashi, an expert in Lightning Release. Once the principle was explained, he would be able to replicate it very quickly.
As for Sasuke, due to his lack of foundation, he was writing furiously with his Sharingan activated, afraid of missing a single word.