"Incredible power..."

"Such a small ninjutsu release, yet it produced the volume of a lake."

"Just how much did you compress your chakra, kid?"

As it looked at the completely devastated forest and the sudden appearance of a vast lake on the ground, even the Devil couldn't help but be astounded by Yu's ultimate Water Release jutsu.

"You're back, Devil."

Hearing the voice of the Devil, which he hadn't heard in a long time, a smile crossed Yu's face.

"Hmph, don't act all friendly with me."

"I'm still upset about the last time."

Despite Yu's joy, the Devil poured cold water on him.

"You're still mad about last time..."

Hearing the Devil's feigned indifference, Yu scratched his head, feeling a bit embarrassed, and then a curious look appeared on his face.

"But come to think of it, I'd really like to see what you look like when you're angry..."

Since awakening the Devil within himself, Yu had fantasized about the Devil's appearance more than once. With the sultry, seductive voice of the Devil, Yu imagined the Devil as a temptress with a voluptuous figure, a bust size beyond 36E, a captivating face, and a single glance that could enthrall anyone.

"Hmm? Why do I feel..."

Seemingly sensing Yu's thoughts, the Devil's sultry voice took on a hint of suspicion.

"Uh, well..."

Returning to reality, Yu cleared his throat awkwardly.

"I hope you won't be too angry when you see it, because I'm developing a jutsu even more dangerous than the Hard whirlpool Blade."

With these words, Yu, who had been in training, began to remove his kimono jacket to reveal a sleeveless undershirt underneath.

"What are you up to, kid?!"

Seeing this, the Devil was alarmed and had a bad feeling about it.

"Boom!"

Before the Devil could react, a massive surge of chakra erupted from Yu's body.

Actually, it wasn't just chakra—it was a highly compressed and violent ninjutsu.

"Rumble..."

Accompanying Yu's intense outburst of highly compressed ninjutsu, his two arms on either side formed violent hurricanes, instantly shattering all the rocks on the surrounding ground.

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Finally, a pair of dazzling white lightning wings formed on Yu's shoulders and back, looking radiant.

"What is this?!"

"Yu! Your physical strength?!"

Seeing Yu's sudden surge of power, the Devil's voice trembled in disbelief.

Because of her presence within Yu, the Devil could clearly feel that the power surging through Yu had increased tenfold in an instant.

Different from ninjutsu in the Naruto world and Devil Fruits in the world of One Piece, she had never seen this kind of ability before.

"This kind of power... Could it be complete?"

"Equivalent to the Eight Inner Gates..."

With his back and shoulders wrapped in white lightning, feeling the rapidly increasing power within him, Yu's eyes widened.

At this moment, he had no doubt that he could smash everything in front of him with a single punch.

"No, wait..."

"This level of amplification is far from matching the Eight Inner Gates."

However, when he thought of Might Guy opening the Eight Inner Gates, unleashing power that far exceeded that of Kage-level shinobi, even overwhelming the Six Paths Madara, Yu shook his head with some dissatisfaction.

"It seems far from being completed."

"Are you crazy?!"

"Stop it!!"

Although she didn't know what new jutsu Yu had developed, sensing the power multiplying uncontrollably in his body, the Devil's voice shouted urgently in Yu's ears.

"Boom!"

But it was too late.

Under the relentless increase in power, Yu's highly compressed ninjutsu on his back and shoulders had yet to stabilize. The coiling white lightning finally exploded with terrifying force, sending Yu flying like a cannonball.

"Bang, bang!"

After breaking two large trees in a row, Yu finally fell to the ground in a sorry state, covered in horrific wounds all over his back.

"Infernal Healing!"

However, Yu seemed to be prepared. Using his powerful chakra, he quickly began to heal the severe injuries on his back.

This was one of the advanced medical ninjutsu that Yu had mastered—an ability to identify the location where an attack would hit before being struck, rapidly concentrating a certain amount of chakra at that point, and automatically healing the wound upon being injured.

"It seems like I failed again..."

"Thank goodness I was prepared, or I would have been dead."

After lying on the ground for more than ten minutes, Yu finally completely healed the severe injuries on his back.

The dangerous new forbidden jutsu he had attempted just now was none other than Shunko from the world of "Bleach."

In the past three months, apart from treating wounded ninja in the Konoha Medical Corps, Yu spent all his remaining time reading scrolls of ninjutsu and training in the Hokage's office. Occasionally, he sought advice from the Third Hokage, making significant progress in his ninja training.

His chakra reserves and levels had also been continuously increasing, leading Yu to consider developing a new jutsu. The Eight Inner Gates, a Forbidden Taijutsu technique in the Naruto world, could release all the body's restrictions when fully unlocked, known as the "Eight Inner Gates Formation," granting power surpassing Kage-level several times or even hundreds of times.

However, the price was rapid physical deterioration, leading to death even with the assistance of Yin-Yang Release. Shunko, on the other hand, was the ultimate combat technique in "Bleach," combining Kidō and Hakuda. When activated, it produced an explosive increase in power, surpassing one's own abilities tenfold or even more.

So, Yu wondered—since Shunko in "Bleach" could combine Kidō and Hakuda, could he try combining ninjutsu and taijutsu in the Naruto world to develop a forbidden jutsu that could match or surpass the Eight Inner Gates without such severe side effects?

After extensive research into ninja techniques, Yu finally succeeded. Even this incomplete version of Shunko could increase his physical strength tenfold.

But judging by the extremely dangerous and unstable state of Shunko at the moment, it was far from suitable for combat.

"It seems that completing this jutsu will be quite a challenge..."

Looking at the almost completely destroyed forest around him, his torn clothes, his battered body, and his depleted chakra, Yu couldn't help but wear a wry smile.

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