Haru's defection was, in a clinical sense, an absolute inevitability. It was the calculated culmination of weeks of subtle psychological pressure, deliberate isolation, and the violent shattering of her indoctrination. Her choice marked a monumental turning point in Kei's operational reality; from this moment forward, the panopticon the Main House had built to monitor him was entirely under his control.
After explicitly ordering Haru to return to her quarters and rest, Kei locked the clinic doors. He whistled a soft, cheerful tune as he navigated the hidden passage descending into the subterranean laboratory.
Inside the freezing, dimly lit basement, Shisui Uchiha was meticulously executing a series of rigorous, bare-handed rehabilitation katas. Hearing the rhythmic tap of the doctor's cane on the stone floor, Shisui did not pause his movements.
Kei expanded his sensory web, mapping the repaired muscle fibers and the steady flow of chakra within the fallen prodigy. "Excellent progress, Shisui. Your cellular regeneration is stabilizing nicely. I project you will recover half of your original physical output within the week."
"Physical output is meaningless," Shisui rasped, throwing a sharp jab that cut through the heavy air. "Without the Mangekyo Sharingan, my combat parameters max out at the Jonin level. I lack the overwhelming, absolute power required to suppress the civil war. I cannot save my bloodline like this."
"The immediate procurement of a Mangekyo Sharingan is unfortunately beyond my current logistical capabilities," Kei mused, tilting his head. "However... if it is simply a matter of restoring visual input, that is easily rectified. You are well aware that my practical surgical skills are quite extensive."
Hearing the sheer, casual detachment in the doctor's voice, Shisui's body violently stiffened. His mind instantly flashed back to the agonizing nightmare of his resurrection—the smell of his own burning flesh and the brutal, unanesthetized electrotherapy Kei had utilized to restart his heart.
Taking a sharp, deep breath to steady his racing pulse, Shisui lowered his fists. "Forget it. Standard ocular implants will offer me zero tactical advantage against the Uchiha elite. Furthermore, while my sensory perception is not nearly as mutated as yours, I can navigate my daily existence without eyes."
"A standard optical array is indeed insufficient for your needs," Kei agreed smoothly. "But what if I were to acquire—"
"I am warning you right now, Hyuga Kei," Shisui snarled, his chakra flaring with sudden, lethal intensity. "If you lay a single scalpel on my clansmen to harvest their eyes, I will tear you apart. Debt or no debt."
Kei did not even flinch at the killing intent. "Do not agitate your newly sutured cardiac tissue, Shisui. I never stated I possessed the intention of butchering your relatives for spare parts. But even if I refrain from harvesting them... do you honestly believe the vultures circling your compound will share my restraint?"
Shisui's jaw locked. The memory of Danzo Shimura ripping his right eye from its socket silenced his protests. He knew Kei was absolutely correct.
"Focus entirely on your physical rehabilitation. Reclaim every fraction of your lethality that you can," Kei instructed, turning his blind gaze toward a row of complex surgical equipment resting against the far wall. "In the meantime, I will theorize an alternative methodology to elevate your combat capabilities."
"What exactly are you plotting?" Shisui demanded, his scarred face a portrait of absolute, paranoid vigilance.
"Do not be so terribly nervous, Shisui," Kei offered a warm, chilling smile. "You owe me a monumental sum of capital. Would I truly damage such a valuable investment?"
Without offering further clarification, Kei turned and exited the subterranean clinic. After confirming that the perimeter was secure and that Neji's psychological seed was properly planted, he prepared to retire for the evening.
However, as Kei emerged from the clinic and navigated the winding, shadowed alleys near the impoverished outskirts of the clan compound, his sensory web snagged on a highly anomalous signature.
Ever since the legendary Sannin, Orochimaru, had defected from Konoha, the gruesome disappearances in the slums had ceased. Yet, the environment remained a suffocating, decaying labyrinth of poverty.
Stepping out of a particularly narrow alleyway, Kei heard the faint, distinct hiss of scales sliding over wet cobblestones. He deliberately halted his advance.
A small, immaculately white snake materialized from the shadows near the mouth of the alley. It raised its head, its golden, slit-pupiled eyes locking directly onto the blind doctor. Its forked tongue flicked rapidly, tasting the air. Then, the serpent turned and slithered deeper into the absolute darkness of the dead-end alley.
Kei hesitated for only a fraction of a second before following the creature into the pitch black.
Deep within the shadows, the white snake coiled upon itself and stopped.
"Lord Orochimaru," Kei greeted smoothly, leaning on his cane. "It has been quite some time."
When the serpent opened its jaws, the raspy, chillingly androgynous voice of the rogue Sannin echoed from its throat. "Kei-kun... you do not seem the slightest bit surprised that I have returned to seek you out."
"Is it not the natural order of things for a mentor to occasionally check on the progress of his student?" Kei replied, his tone perfectly even.
The white snake's golden eyes narrowed, and the creature's mouth contorted into a horrifying, human-like smirk. "Kei-kun. I have always believed your intellect would be far better served operating directly by my side."
"As I have previously stated, I am merely a bird trapped in a cage," Kei deflected the recruitment pitch effortlessly. "Tell me, Lord Orochimaru. Do you require my clinical assistance with a specific variable?"
"Are you truly willing to execute an operation for me?" the snake hissed, its tongue flickering. "You are well aware that I am an S-rank traitor to the Leaf."
"If the parameters of the operation are within my logistical capabilities, my allegiances are highly flexible," Kei answered, a masterclass in offering everything while promising nothing.
The white snake bobbed its head in a nod. "You have been making quite a name for yourself recently, Kei-kun. Earning the personal, highly classified favor of the old Hokage. I imagine Hiruzen will be loading your shoulders with significant responsibilities very soon."
Kei's posture remained relaxed, but his mind instantly went on high alert. "It is merely because my psychiatric methodologies occasionally prove useful to the military apparatus. However, Master... your intelligence network is truly terrifying. You possess operational clarity before the ink on the Hokage's desk has even dried."
His commendation from Hiruzen Sarutobi regarding Kakashi's rehabilitation was an absolute, ANBU-level secret. It had not been publicly gazetted. For Orochimaru—a man currently hunted across the continent—to possess that specific intelligence meant only one thing.
Orochimaru's sleeper agents within Konoha had not been entirely purged during his defection. He still possessed high-ranking assets buried deep within the village hierarchy—likely holdovers from his dark alliance with Danzo's Root.
The white snake slithered forward, stopping mere inches from the tip of Kei's metal cane. "The mechanics of my network are of no concern to you. My intelligence indicates you engaged in multiple, highly confidential interactions with Shisui Uchiha prior to his demise."
"That is correct," Kei acknowledged, taking a microscopic half-step backward to maintain a sterile perimeter. "But the boy is dead and his corpse is lost to the river. If you are attempting to harvest Shisui's ocular secrets through my clinical notes, you will be profoundly disappointed."
"I am aware the prodigy is gone. That is precisely why Shisui is not my primary target."
"Then who has captured your interest?"
The white snake coiled upward, elevating its head to stare directly into Kei's bandaged face. "Itachi Uchiha. I require you to compile a comprehensive psychological and tactical profile on the boy."
Kei's mind raced. "Given the current, violently explosive political tension between the Uchiha compound and the Hokage Tower, infiltrating Itachi's inner circle to gather actionable intelligence will be nearly impossible in the short term."
"Time is of no consequence to a serpent. I can wait," Orochimaru hissed.
"You understand my logistical constraints, Master. I am burdened with running a full-time medical practice. I do not possess the surplus capital or the free time to conduct black-ops surveillance..."
The white snake paused. Orochimaru recognized the negotiation tactic instantly. "Speak your price, Kei-kun. What exactly is it that you desire?"
"Master," Kei began, his voice dropping all pretense of warmth, hardening into cold, absolute ambition. "During your tenure in Konoha... did you ever conduct localized, invasive research regarding the Hyuga Clan's Caged Bird Seal?"
The white snake froze. The golden eyes stared unblinking at the blind youth. For a long, heavy moment, the only sound in the alley was the distant dripping of water.
"So... that is the true objective behind your brilliance," Orochimaru finally rasped, a note of dark, genuine respect coloring his voice. "But I am afraid I must disappoint you, Kei-kun. I possess no methodology to break the Caged Bird Seal."
"Countless brilliant minds before me have attempted to dissect and dismantle the curse mark. They all failed catastrophically. I am no exception."
Kei frowned beneath his bandages. "May I ask for the specific, clinical reasons regarding their failure?"
"After conducting multiple, highly invasive vivisections on intercepted Branch members, I confirmed a terrifying reality," Orochimaru explained, his voice taking on the detached cadence of a morbid scientist. "The Caged Bird Seal is not merely a physical brand seared into your brain stem and optical nerves. It is anchored to your very soul."
"Therefore, unless a shinobi possesses the god-like capability to directly edit and erase a curse mark on a spiritual, soul-bound level... or completely transfer the host's consciousness into a new vessel... removing the seal is a mathematical impossibility."
"I have not yet mastered the former. And regarding the latter... if your soul is violently ripped from its original vessel, your physical body would die."
The devastating diagnosis struck Kei like a physical blow, his heart slamming against his ribs. The seal wasn't just physical; it was a spiritual parasite.
Forcing his breathing to remain steady, Kei masked his internal horror with cold pragmatism. "Regardless of your final conclusions, Master... I require the complete, unredacted research data detailing those Caged Bird experiments."
"What tactical value could my failed data possibly provide you?" Orochimaru scoffed softly. "The pursuit is entirely meaningless. You would be far wiser to demand a lethal jutsu or a financial fortune."
Kei shook his head slowly. "For a bird trapped in a cage, Master... what meaning does a fortune hold compared to the blueprints of the lock?"
Orochimaru fell completely silent. The serpent stared at the blind doctor, analyzing the sheer, suicidal magnitude of the boy's ambition.
Slowly, the white snake unhinged its jaws. From the depths of its throat, it regurgitated a thick, saliva-covered scroll, dropping it onto the wet cobblestones at Kei's feet.
"Everything you requested is codified within," Orochimaru hissed as the snake began to melt back into the shadows. "But I strongly advise you, Kei-kun... do not harbor false hope. The cage was designed to be absolute."
Kei knelt and retrieved the vile-smelling scroll, his grip tightening around the parchment. No one in the world understood better than him just how vital this data was. It wasn't just research; it was the first stepping stone to his absolute freedom.