According to what is currently known, the first person to successfully manifest Susanoo was Indra, the eldest son of the Sage of the Six Paths.
Compared to his younger brother Asura—who, while still of the Ōtsutsuki lineage, possessed more ordinary traits—Indra clearly inherited and amplified the Sage's spiritual power, which had been mutated and intensified by strong emotions.
It is likely that the secret behind Susanoo lies in that very spiritual mutation.
Orochimaru shares a similar theory, but unlike vague myths and hearsay, his conclusions are rooted in scientific analysis.
Creating form from nothing—manifesting chakra into tangible constructs—is a known feature of Yin Release.
But that alone doesn't explain it. For instance, the Nara clan also wields Yin Release through their shadow manipulation techniques. Yet, even the strongest among them never achieved anything close to Susanoo. Their skills only improved in degree, not in kind.
Orochimaru speculates that the ability to form Susanoo may depend on the strength of one's spiritual energy—or even the durability of the soul itself.
While most people could never overcome this limitation, Orochimaru has the "Serpentis" within him. Perhaps, with time, he may be able to develop a similar technique.
His current creation, the Eight-Headed Serpent Technique, can rival Susanoo in scale—but not in power. It's a brute force defense, more suited to surviving than winning. Effective, perhaps, against average opponents—but far from sufficient for what lies ahead.
And so, Orochimaru has been carefully observing the properties of Susanoo, meticulously recording each detail.
The skeletal half-form, the armored upper-body warrior—he notes everything, as precisely as possible.
Still, such notes are only references. Ultimately, a technique like Susanoo is awakened by feeling. No outsider can truly describe or pass it on.
It doesn't rely on the twelve basic hand seals. For now, there's simply no way to teach it.
Which is why, after completing his documentation, Orochimaru removed Shisui's Mangekyō Sharingan and tested it for himself.
Though the results were weaker than those of the original user, the process alone offered valuable insight.
"Very good," he said, storing his notes into a scroll. He looked up at Shisui and smiled. "Your cooperation has been invaluable."
"You're too kind, Lord Orochimaru," Shisui replied.
That said, he couldn't help but wince as he reinserted his eyes.
It still felt unsettling—the idea of one's body parts being treated like loanable tools. Orochimaru had returned them in perfect condition, but still...
How many people have used my eyes now? Shisui wondered, lost in thought.
Granted, he had used the eyes of fallen clan members before, but still...
Before he could dwell further, Orochimaru interrupted.
"There's something else I need your help with."
---
"…Why do you say it's fake? The Evil God really exists,"
Hidan muttered, withdrawing a kunai from his sleeve—not to attack the fruit vendor in front of him, but to dramatically stab into his own chest and stomach.
Disheveled and ranting, he continued, "Look at this—this power was given to me by the Evil God! If you join me in worship, you can have it too!"
The fruit vendor grimaced and turned to Uchiha Shinsuke. "Sir… what is wrong with this man?"
"Don't mind his nonsense," Shinsuke replied flatly, massaging his temple. "Something's clearly not right in his head."
"Hey! Who are you calling crazy? That's slander!"
Hidan erupted, his words firing off like a machine gun. He ranted and raged, a chaotic display of wounded pride and pent-up fury.
But no matter how much he raged, Shinsuke didn't react with pain or anger—the responses Hidan craved the most. Instead, the man's cold silence left him frozen in place, humiliated.
After a few more futile outbursts, Hidan gave up on trying to provoke him. But that didn't mean he'd let it go quietly—at the very least, he had to throw in some insults.
---
Watching from a nearby rooftop, Orochimaru turned to Shisui and asked, "What do you think?"
"It's not quite enough… not worth using Kotoamatsukami," Shisui replied, frowning. The thought of using such a powerful genjutsu on someone like Hidan didn't sit well with him.
"There was another incident last night," Orochimaru said. "He went on a missionary rant, broke into a shop, and nearly wiped out a family."
"If Shinsuke hadn't discreetly planted a hypnotic suggestion in him earlier, he might have succeeded."
"No fear of pain, unable to die, and without any moral restraint… he's a dangerous lunatic."
Shisui's expression darkened.
Protecting the village had always been his priority. Individuals like Hidan posed a real threat—especially during moments of inattention when even someone like Shinsuke couldn't be there to intervene.
However, unlike Orochimaru, Shisui preferred to neutralize such threats permanently.
"This can't continue."
But Orochimaru shook his head. "I need Hidan. His value is immeasurable. Killing him would be a waste."
Even if Hidan had succeeded last night, Orochimaru would have gone to great lengths to keep him alive.
Of course, that would stir political turmoil. The Hokage, the advisors, and Danzo would all seize the chance to make Orochimaru pay dearly.
Shisui understood the subtext.
Using Kotoamatsukami to control Hidan was Orochimaru's way of striking a balance—protecting the village without sacrificing a valuable asset.
Left with little choice, Shisui nodded. "When do you want me to do it?"
"No rush," Orochimaru said with a sly smile. "If I recall correctly, using Kotoamatsukami drains your ocular power. Do you want me to take your eyes out again for another test?"
Shisui frowned. "What do you mean?"
"Simple. Physical enhancement surgery," Orochimaru replied, licking his lips. "With your current pupil strength, we can complete the operation. Afterward, your Mangekyō Sharingan will be able to regenerate its power naturally."
Thanks to his recent advances—especially through research on Hidan—Orochimaru's understanding of cell fusion had reached new heights.
Shisui's genetic compatibility and unique eyes made the risks minimal.
Tempted, but cautious, Shisui hesitated. "But… didn't the Third Hokage forbid unsanctioned surgeries like this?"
Orochimaru raised an eyebrow. "A minor detail. If you don't tell, and I don't tell—who's going to know?"
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