After capturing Shinno and extracting many secrets from him, Satori Hyūga was thoroughly satisfied.
He threw himself into research, working alongside Orochimaru on [Body Regeneration].
[Body Regeneration] could be considered the pinnacle of medical ninjutsu—using chakra to stimulate cell division to rapidly heal wounds.
However, the technique was both profound and complex. It couldn't be perfected or applied to one's own body overnight.
To accelerate experimentation and practical use—to allow his own body to regenerate—Satori turned his gaze toward the imprisoned Shinno.
He arrived at a secret underground chamber and met Shinno once more.
Don't underestimate Shinno just because he came from the movies—his talent in medical arts and research was truly impressive.
If he hadn't failed at the final stage, he might have truly unleashed great devastation on the entire ninja world.
By absorbing negative emotions from people's hearts, he could activate the [Eight Gates] Formation and become nearly impervious to damage.
As long as the opponent didn't land a fatal blow, he could heal endlessly—and grow stronger.
A Taijutsu powerhouse like that, crafted entirely through medical ninjutsu, defied all logic—it barely fit within the conventional framework of ninja combat.
If one could force open the Eight Gates, train diligently, and adapt well, they might even earn recognition from Madara himself.
When he reached the cell, Satori immediately saw Shinno locked inside a cage.
At that moment, Shinno sat dejectedly on the ground, head bowed low, seemingly lost in thought.
Hearing movement, Shinno quickly raised his head to check.
Seeing the visitor was Satori, his eyes narrowed sharply, flashing with deep hatred.
"You really are someone unexpected. Who exactly are you? And how do you know my true identity?"
No matter how hard he tried, he couldn't figure out how he had been exposed.
Moreover, this person not only knew who he was but also clearly understood he practiced [Eight Gates].
This terrifying level of information access made him feel uneasy.
He had absolutely no knowledge about this person—everything had unfolded entirely under the other party's control.
Satori smiled slightly and said, "Master Shinno, I'm simply a member of the Hyūga Main House who invited you here for treatment."
Originally, his intention had indeed been to bring Shinno in to cure his condition, so this explanation wasn't inaccurate.
But Shinno didn't buy it. He scoffed coldly, "You certainly have quite the methods. Is imprisoning me your way of treating someone?"
He glanced mockingly around the tightly secured cell, covered densely with intricate jutsu inscriptions. Even on his own body were several seals suppressing chakra.
These extreme precautions left him with no hope of escape.
Satori looked helplessly at Shinno and said, "I'll admit it was my fault, but I couldn't possibly allow the leader of the Sky Ninja remnants to wander freely around Konoha. If things had gotten out of hand, it would have caused chaos."
"You've probably realized I'm also cultivating [Eight Gates]. In a way, we're walking the same path. If you cooperate willingly, I'll spare your life."
"All I need is for you to sincerely assist me in researching [Body Regeneration]."
"With your skill, I believe you might one day walk out of here—with your research completed."
To get Shinno to work for him, Satori Hyūga played both the villain and the savior, offering him just enough hope to cling to.
Shinno was silent for a moment before asking, "Do I really have the right to refuse?"
"You do," Satori replied. "But I don't tolerate freeloaders."
The unspoken message was clear — if you don't cooperate, you die.
Shinno, brimming with resentment, couldn't help but reflect on how far he had fallen.
If only his research on the Zero-Tails had succeeded—perhaps then he could have unleashed a surge of power drawn from his own negative emotions.
Unfortunately, there's no such thing as 'what if.'
As a prisoner, Shinno had no real choice in the matter.
His ambitions were vast; he refused to see his life end in such a manner.
Facing Satori, he lowered his head and said, "I agree. After all, this was research I had already intended to pursue."
Suddenly, he found himself thinking that the situation wasn't so dire after all.
Previously, he'd struggled to gather resources and funds for his experiments alone.
Now, despite being imprisoned, he wouldn't have to worry about funding anymore—he could simply use this guy's money and materials instead.
The research results would still belong to him.
Better yet, their objectives overlapped perfectly: pursuing the Body Regeneration Technique and forcibly unlocking the Eight Gates technique.
Thinking this way, he actually started feeling less miserable.
"Good choice," Satori said, clapping approvingly. "A wise man adapts to circumstances." With that, he opened the cell door.
The prison gate swung wide open. Shinno's eyes flickered with thought, but he made no move to attack.
He had mastered Medical Ninjutsu and the Eight Gates technique—his Taijutsu might not be unmatched, but it was certainly on par with that of a Jonin.
Yet the youth before him had also trained in the Eight Gates, and his power level was impossible to gauge.
In his current state—with his Chakra suppressed—playing along seemed like the smarter option.
After all, even if he defeated this boy, escaping the prison entirely would still be impossible.
Orochimaru's and Might Guy's strength were still fresh in his memory; he knew better than to act recklessly.
Seeing that Shinno made no move to strike, Satori suddenly moved like lightning—grabbing the top of Shinno's head, then swiftly moving to his neck, chest, and various acupoints along his limbs.
One after another, Sealing Techniques spread from Satori's hands onto Shinno's body, causing constant shifts across his expression.
As a master of medical arts and scientific research, Shinno immediately recognized these as advanced Sealing Formulas.
Yet he didn't resist, allowing Satori to continue without interference.
If someone lets you conduct your research freely, shouldn't some form of control naturally follow?
Placing himself in Satori's position, Shinno even came to view the seals as a form of protection.
Without them, he'd probably suspect Satori of planning to discard him once his usefulness ran out.
Once the seal inscription was fully engraved, Satori finally released a long breath.
"This is my own creation," he explained, "a fusion of the Caged Bird Seal and key pressure points—the [Life-and-Death Sealing Technique]."
Also known as the ninja world's version of the Shen Si Fu, the Life-and-Death Sealing Technique allowed Satori not only to control someone's life and death, but also to subject them to unbearable physical and mental agony—pain severe enough to cause unbearable suffering, making one long for death over life.
It could be said that this Life-and-Death Sealing Technique was Satori Hyūga's culmination of his clan's "Caged Bird Seal."
"Master Shinno, the entire laboratory is now open to you—you may conduct any experiments you wish."
"This is Konoha's research on bodily regeneration through Medical Ninjutsu. You're free to study and explore it too."
"Just a reminder—you are only allowed to move freely inside the laboratory. Leaving the lab will lead to serious repercussions, and I believe you won't want to test that."
Shinno had already come to terms with the situation. He nodded slightly, then fixed his gaze upon the Medical Ninjutsu scroll presented by Satori Hyūga.
He hadn't expected to gain access to Konoha's medical knowledge—it was truly a welcome surprise.
However, not even a trace of gratitude appeared on his face. Instead, he masked a deeper hatred beneath his calm exterior.
Silently vowing, Master Shinno thought: Konoha, one of the Five Great Ninja Villages... I will escape from here someday and overthrow you all, leading the Kumo Village Remnants to conquer the world.
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