Lying flat on the cold steel of the operating table, Kei untied his Konoha headband and let it fall to the floor, fully exposing the intricate blue curse mark branded into his forehead. He took a slow, centering breath, relaxing his musculature.
He offered Haru a calm nod, signaling she could begin the diagnostic.
Haru hesitated, her hand hovering a few inches above his face. "Kei-sama... perhaps we should delay this. We can run the peripheral diagnostic on Saku several more times to ensure absolute safety before we test your seal."
Staring down at the Caged Bird Seal, and then looking into Kei's dull, sightless eyes, Haru found herself paralyzed by a sudden, intense wave of protective anxiety. She had felt absolutely zero moral reluctance when torturing Saku Hyuga, but Kei was entirely different. The thought of accidentally triggering his cerebral incineration terrified her.
"In the pursuit of absolute freedom, Haru, one must inevitably accept a margin of risk," Kei offered a gentle, reassuring smile. "You have already mapped the perimeter, have you not? Repeating the baseline test will not yield new variables."
"Furthermore, even if the diagnostic fails and the perimeter nodes activate... I will merely experience a slight migraine. I have a remarkably high tolerance for pain."
Looking down at Kei's resolute, warmly smiling face, Haru swallowed her fear. She forced her hand to stop trembling, slowly lowered her palm, and rested her fingertips gently against his forehead.
"I am initiating the diagnostic now, Kei," Haru whispered, her voice tight. "If you experience even a fraction of discomfort, you must order me to stop immediately."
"Proceed," Kei replied simply. "I will not die by myself with an experiment."
Haru nodded. She focused her mind, channeling a highly compressed, microscopic thread of chakra from her fingertips directly into the blue ink of the Caged Bird Seal.
Kei instantly felt the subtle, foreign energy breach his neural network. The physical sensation was identical to the monthly 'inspections' the Main House elders secretly performed on him.
This initial confirmation profoundly reassured Kei. If the absolute outer perimeter reacted identically to his historical data, the rest of the matrix was likely inert.
Sensing absolutely zero physical distress from the doctor, Haru spoke softly. "I have breached the epidermis. I am about to formally penetrate the outermost energetic layer of the seal. Report your status."
"Status normal," Kei confirmed. "Proceed."
Haru carefully pushed her chakra through the Caged Bird Seal's primary defensive barrier. The process was unnervingly smooth.
After breaching the barrier, Haru paused, her brow furrowing in deep concentration as she mapped the internal architecture. "The structure is identical to Saku's. I am detecting a dense network of red energetic connection points."
She let out a shaky breath. "Kei... the physical matrix of your Caged Bird Seal is completely intact. If we push further under these conditions, the statistical probability is that we will trigger the pain-compliance protocol."
The fact that the physical connection nodes were intact was exactly what Kei had anticipated. "Continue, Haru. Push your chakra forward and make direct contact with the nodes."
The Main House elders were paranoid, ruthless operators. If the physical architecture of his Caged Bird Seal had miraculously vanished, they would have noticed years ago, and he would have been executed as an anomaly.
Therefore, his clinical hypothesis remained strong: the Caged Bird Seal was fundamentally a spiritual parasite. The ink on his forehead was merely the physical housing. Even if the housing and the trigger mechanisms were perfectly intact, they were entirely useless if the spiritual explosive they were wired to no longer existed.
"Brace yourself," Haru warned, her voice trembling slightly. "I am making contact now."
"Do it," Kei ordered calmly.
Haru took a deep breath, refined her chakra control to its absolute limit, and deliberately brushed her energy against the red connection nodes within the seal.
As she made contact, she instinctively held her breath, her heart pounding against her ribs, terrified that the resulting agony would shatter Kei's composure.
Behind them, standing in the shadows, Shisui Uchiha also tensed. Although he could not visually track the microscopic chakra flow, he could sense the massive spike in Haru's anxiety. Shisui knew he could not single-handedly prevent his clan's annihilation; he needed the doctor's intellect to survive.
One second passed. Five seconds. Ten seconds.
The basement remained completely silent.
Kei did not scream. He did not convulse. To be precise, he felt absolutely nothing at all.
"Haru," Kei finally asked, breaking the agonizing silence. "Have you initiated contact with the connection nodes?"
Haru stared down at him, her expression a portrait of absolute, staggering disbelief. "I have been actively stimulating the nodes for over ten seconds..."
She couldn't process the reality. Just minutes ago, when she had brushed these exact same energetic tripwires inside Saku's skull, the servant had shrieked in mind-shattering, blinding agony. Yet, Kei was lying perfectly still, carrying on a casual conversation.
"Are you absolutely certain your chakra is engaging the nodes?" Kei pressed.
Haru nodded vehemently, though she knew he couldn't see the gesture. "I am positive. I am making direct, sustained contact. But... the Caged Bird Seal is completely failing to trigger its defensive mechanism."
Still wrestling with the impossibility of the data, Haru shook her head. "How is this medically possible? The physical matrix of the seal is perfectly intact. The trigger is functioning. Why aren't your pain receptors overloading?"
"The mechanics of the failure are secondary right now," Kei stated, a thrill of profound, intoxicating excitement finally bleeding into his voice. "Do not halt the diagnostic. Push your chakra past the nodes. Breach the core matrix of the seal."
At this point, the diagnostic was functionally over. If the seal's primary defense mechanism failed to recognize him as a valid target, the core was undoubtedly an empty shell.
However, Kei was a man of science. To achieve absolute, 100% certainty, he could not abort the experiment halfway. He had to prove the core was dead.
Haru swallowed her lingering doubts, forced her hands to steady, and pushed her chakra deeper.
She bypassed the red connection nodes entirely, driving her energy straight into the absolute center of the Caged Bird Seal. Throughout the entire invasive process, Kei remained perfectly relaxed, experiencing zero physiological distress.
As Haru's foreign chakra flooded into the core matrix, the seal reacted.
It was like throwing a spark into a powder keg. The blue ink branded into Kei's forehead suddenly flared with a brilliant, pulsing azure light. It was the visual signature of a Caged Bird Seal entering its terminal, self-destruct protocol.
Seeing the seal detonate, Haru panicked violently, terrified she had just killed him.
Yet, Kei simply smiled.
He casually raised a hand and rested his palm against his own glowing forehead. He could feel a faint, ambient warmth radiating from the activated ink, but absolutely nothing else. His brain was not incinerating. His soul was untouched.
A few seconds later, the terminal sequence sputtered out. The azure glow faded, returning the seal to its dormant, blue state.
Kei remained perfectly unharmed.
"Kei... the Caged Bird Seal actually failed to execute you!" Shisui gasped from the shadows, his voice thick with shock. "Is this the result of the trauma that destroyed your optic nerves?"
Seeing the doctor sit up unharmed, Shisui let out a massive sigh of relief. Yet, as he watched the slow, victorious, terrifying smile spread across Kei's face, Shisui felt a sudden, primal chill run down his spine. He felt as though he were watching a monster finally slip the last lock on its cage.
Unburdened by the absolute threat of the curse mark, this blind doctor was going to be an unstoppable force.
Naturally, Kei was entirely unconcerned with the Uchiha's internal apprehension.
"The origin of the failure is irrelevant now, Shisui," Kei announced, sitting on the edge of the operating table. "What is critically relevant is that without the absolute, lethal restraint of the Main House hanging over my head... I can aggressively accelerate my operational timeline."
"Previously, the threat of the Caged Bird Seal prevented me from conducting deeply invasive surgical diagnostics on my own biology. Now, I can fully dissect my own ocular cavities to determine if my optic nerves are truly beyond repair."
Thanks to Orochimaru's exhaustive, gruesome medical logs, Kei now possessed the theoretical blueprints for advanced ocular extraction, preservation, and transplantation surgeries. He was fully prepared to physically remove his own eyes for a comprehensive diagnostic.
Before initiating the surgery, Kei turned toward his assistant, who was still staring at his forehead in shell-shocked awe. "Haru. You executed the diagnostic flawlessly. If you are experiencing psychological fatigue, you are officially dismissed for the evening."
Haru snapped out of her daze, shaking her head firmly. "No. I wish to remain on station. I am your clinical assistant, am I not?"
"You are indeed," Kei smiled warmly. "However, the subsequent procedure will be significantly more visceral than a chakra probe. Try not to faint."
No sooner had the words left his mouth than Kei reached onto a nearby tray, pulling on a pair of sterilized surgical gloves. Utilizing a set of specialized, chakra-infused surgical extractors, Kei calmly, methodically, and entirely unanesthetized... removed his own eyes from their sockets.
Throughout the entire, horrific process, Kei maintained his placid, conversational smile, not even flinching as the optic nerves were temporarily decoupled. The only indicator of trauma was the thin streams of blood tracing down his cheeks, rendering his smile profoundly terrifying.
A shinobi's physiological pain tolerance and cellular resilience are astronomically higher than a civilian's. A surgical extraction that would induce fatal shock in an ordinary man was a standard outpatient procedure for an elite operative.
Crucially, as the Byakugan were severed from his neural network, the Caged Bird Seal on his forehead remained completely dormant. This provided the final, absolute, empirical proof: the seal was functionally dead.
Wasting no time, Kei placed his dull, gray eyes into a sterile petri dish, flooded them with a highly concentrated nutrient solution, and slid the dish into a state-of-the-art medical scanner he had recently purchased through the black market.
"Now, we wait for the pathology report," Kei announced, wiping the blood from his face with a sterile cloth.
Haru and Shisui stood in absolute, horrified silence, processing the sheer, sociopathic detachment the doctor had just displayed.
Thirty minutes later, the scanner chimed, spitting out a dense scroll of medical data.
Haru retrieved the printout and began to read the analysis aloud. Her voice quickly grew grim. "The vast majority of the retinal and macular cells are entirely necrotic. Cellular activity is registering at near-zero parameters. The primary and secondary ocular blood vessels are completely occluded..."
It was a cascading list of catastrophic biological failures. Haru's voice trailed off, unable to finish the devastating prognosis.
"Given this level of necrosis," Haru concluded softly, "a full ocular transplant is the only viable medical option. However, harvesting a pure Byakugan is a near impossible task. The clan secures all harvested eyes within the Main House's deepest, most heavily guarded subterranean vault."
"A transplant is a crude, final resort," Kei shook his head, rejecting the premise. "According to the diagnostic report, the primary physiological hurdles are cellular necrosis and severe vascular occlusion."
"Therefore, if we can procure a medical ninjutsu capable of extreme cellular revitalization, and subsequently clear the vascular blockages... it is theoretically possible to force the original eyes to regenerate."
In Kei's clinical assessment, biological originality was paramount. No matter how flawless a surgical transplant was, the host body would inevitably experience micro-rejections, preventing a 100% perfect chakra synchronization. To achieve the absolute pinnacle of ocular power, he needed his original hardware.
"But does a medical ninjutsu capable of literal cellular resurrection even exist?" Shisui asked skeptically. "Where would we acquire such a god-like technique? Another one of Orochimaru's abandoned labs?"
Kei calmly retrieved his eyes from the scanner and seamlessly re-inserted them into his sockets, utilizing a burst of medical chakra to reconnect the optic nerves. Aside from a fleeting sensation of severe dry-eye, he experienced no discomfort.
His mind raced, rapidly calculating his new operational objectives.
Objective Alpha: He needed to procure an S-rank cellular revitalization jutsu to repair his Byakugan. While the Byakugan was incredibly difficult to evolve, its final, theoretical form—the Tenseigan—possessed apocalyptic potential. Therefore, repairing his sight was a non-negotiable task.
Objective Beta: He required a massive influx of capital. His current subterranean laboratory was entirely insufficient for advanced cellular regeneration protocols. He needed to purchase significantly higher-tier, restricted medical technology.
Objective Gamma: He needed to rapidly escalate his personal combat lethality while simultaneously maintaining his political cover with the Hokage and the Hyuga Main House.
It was a highly ambitious, potentially contradictory set of objectives. But as Kei meticulously sifted through his canonical knowledge of the shinobi world, he isolated the perfect target.
There was a single individual currently wandering the continent who possessed the exact medical ninjutsu he required, and possessed a unique, exploitable vulnerability.
"There truly is an S-rank ninjutsu capable of absolute cellular revitalization," Kei announced, turning toward Shisui. "But the technique does not belong to Orochimaru. It belongs to a different shinobi."
"So, the immediate task is tracking this individual down. Furthermore, we must massively upgrade this facility. These black-market scanners cannot support cellular regeneration therapy."
"Are you certain this technique exists? Are you certain it will actually work?" Shisui pressed.
"As I demonstrated with the Caged Bird Seal tonight, Shisui... practical application is the sole criterion for verifying the truth," Kei replied. "Fantasizing about theories is clinically meaningless. No matter how grand a promise someone makes you, until you hold the certain proof in your hands, it is nothing but hot air."
"You, of all people, should understand the danger of blind faith."
Shisui lowered his head, the words striking a painful chord. He had placed his absolute, blind faith in the Hokage and the village elders, believing their eloquent speeches about peace and the Will of Fire. In the end, that blind faith had cost him his eye, his life, and doomed his clan.
Kei did not twist the knife further. He turned his focus back to his assistant. "Haru. Please hand me a medical requisition ledger and a pen. I need to draft an urgent missive. You will personally deliver it to Clan Head Hiashi and the Great Elder in the morning."
Haru immediately procured the supplies, though a distinct sense of déjà vu washed over her. The last time she had helped Kei draft a letter, the Main House vault had been bled dry.
Kei began writing rapidly, his dictation flawless:
To the Esteemed Clan Head, Lord Hiashi Hyuga,
I would not presume to interrupt your vital governance of the clan, but considering my current operational parameters, and out of profound gratitude for the Main House's boundless care, I feel it is my sworn duty to report a critical logistical hurdle.
Since reopening my practice, the volume of civilian and shinobi patients seeking my psychiatric and medical counsel has exponentially increased. While I am diligently attempting to process the caseload, I am repeatedly forced to turn away highly complex, critical cases due to a severe lack of advanced medical technology.
Every time I am forced to deny a suffering patient care, I feel a profound, crushing shame. I feel I am actively failing to live up to the glorious expectations of the Hyuga Clan, and simultaneously failing the mandate entrusted to me by Lord Hokage.
Therefore, I humbly request a major infusion of capital to significantly expand the clinic's footprint and procure high-end, military-grade medical equipment, so that I may better serve the Will of Fire.
As you wisely instructed me during our last council, the tasks assigned by Lord Hokage must be completed with absolute, flawless perfection. The expansion of this clinic directly supports His Excellency's vision for village stability. It is solely for this reason that I humbly appeal for the Main House's financial backing.
I have calculated a rough logistical estimate. To achieve the necessary technological upgrades, the operation requires a minimum injection of fifty million ryo. Naturally, a larger endowment would expedite the process.
I am acutely aware that this is a monumental request. Should the council deem it too burdensome and decline the funding, I swear I shall harbor zero resentment. My only terror is that my operational failure will bring disappointment to yourself, Great Elder Taihiro, and Lord Hokage.
Furthermore, my intelligence network has recently located an elite medical specialist who may possess the clinical capability to reverse my ocular necrosis. If this procedure is successful, the data could be utilized to cure any future Main House member who suffers a similar affliction.
Therefore, I humbly request that the clan mobilize its tracking divisions to locate this individual. The target's name is...
Kei concluded the letter with a nauseating paragraph of sycophantic praise. He handed the parchment to Haru, instructing her to memorize the arguments so she could effectively advocate for the funding when she delivered it.
After scanning the exorbitant request, Haru looked up, deeply concerned. "Kei-sama... is it truly wise to aggressively leverage the Hokage's name to extort the Main House? Lord Third never actually authorized a massive expansion of this clinic."
"That is precisely why I am going to visit Lord Third right now," Kei smiled brightly. "To retroactively convince him that the expansion was his idea, and secure his political backing for the extortion."
"You are aggressively manipulating both sides of the table simultaneously?" Shisui asked, genuinely stunned by the sheer, breathtaking audacity of the doctor's strategy. He hadn't imagined such a suicidal political maneuver was even possible.
"In the clinical field, we call it 'maximizing utility,'" Kei replied lightly, grabbing his cane. "Alright, I have wasted enough time chatting. I am going to the Hokage Tower."
"Wait," Shisui protested. "Your self-mutilation took hours. It is three in the morning. Lord Third is asleep."
Kei waved a hand dismissively as he walked up the stairs. "At Lord Third's advanced age, his REM sleep cycles are deeply compromised. He rarely sleeps soundly anyway. My waking him up now is simply a clinical courtesy, helping him acclimatize to his impending insomnia."