Although his cheap teacher, Danzo Shimura, had issued a suspension order barring Hyuga Yu from entering the hospital to work, this was mostly a reminder—
A reminder of what exactly Hyuga Yu should be focusing on.
Therefore, Hyuga Yu still ran back to the Konoha Hospital that very night. He pulled Hiruko—who embodied the spirit of "the people of Huaimin have not yet slept either" [a classical phrase meaning staying up late]—out of the staff dormitory to interrogate him repeatedly. Only after confirming that Hiruko was fully confident in leading the team to complete the theoretical verification of the initial phase of the experiment did Yu finally feel relieved enough to stay overnight in the staff dormitory of the Konoha Hospital.
This sleep was very light, lasting only five hours, as Hyuga Yu's biological clock forced him to wake up at precisely four o'clock in the morning.
As time arrived at February 26th, Hyuga Yu, who had risen quite early, underwent a physical examination at both the Konoha Hospital and the medical institutions affiliated with the Foundation.
A shinobi's physical examination is quite different from that of an ordinary person, and the physical examination standards for humans in the shinobi world—who possess one trillion cells—cannot be compared to those of normal humans on Earth.
Aside from the various bodily values found in standard medical systems, a shinobi must also test their total chakra reserve, chakra pulsation frequency, meridian system conduction rate, cell activity index, mental energy synchronization rate, and other metrics, with values differentiated based on standard ranks from F to S.
Consequently, the partial physical examination report that Hyuga Yu obtained in advance through the Konoha Hospital looked like this:
Shinobi Name: Hyuga Yu.
Registration Number: 009444
Total Chakra Reserve: S
Bone and Muscle Density: S
Neurological Reaction Speed: S
Toxin Resistance and Antibody Profile: S
Chakra Control Precision: ?
Mental Energy Synchronization Rate: S
Skipping past the various rough numerical reports that made him look like a well-rounded "hexagon warrior," Hyuga Yu shifted his gaze onto some more meticulous data, such as:
In the linear testing of cellular ATP concentration, it exhibited a curve that far surpassed that of a normal shinobi, yet resembled a roller coaster.
It was extremely high during the initial phase but had now suddenly plummeted. Although it still vastly exceeded that of ordinary shinobi, it could be read from the spectrum that the energy production inside Hyuga Yu's body had once been exceptionally vigorous; however, right now, the core production line was gradually heading toward the brink of collapse.
Mitochondrial Function and Quantity: In terms of quantity, it far exceeded ordinary people, exhibiting a phenomenon of extraordinary hyperplasia. However, its functional efficiency (OCR) had already approached 0, and a trend of reverse dissipation had emerged.
The concrete manifestation of this was: the mitochondria were no longer producing energy, but instead resembled a battery with electrical leakage, inordinately releasing residual energy and generating a colossal amount of free radicals.
On the item regarding stem cell pool activity and differentiation rate, it was even more directly discernible that the stem cell pools such as bone marrow and mesenchymal cells were abnormally and excessively activated. The differentiation rate had violently surged by 500%, yet 99% of the newly generated cells were ineffective or deformed cells.
This indicated that Hyuga Yu's body resembled a super factory running at maximum efficiency, yet it was frantically manufacturing defective products and exhausting its raw materials.
Of course, this did not affect Hyuga Yu's current might, nor did it hinder him from conducting activities like a normal person or far surpassing normal people. However, it expressed a harsh reality:
This superhuman, formidable strength came with a price.
Involving the various bodily metrics displayed after the physical heterosis of his Yang Release, just as Danzo—who likewise possessed Hashirama cells—had sensed, signs of depletion had indeed already manifested.
To a certain degree, this could be considered a case where "only Stand users can see other Stand users"...
Hyuga Yu looked at the partial report in his hand, which had already detected various adverse phenomena. His expression remained unchanged, and he merely memorized the contents on it one by one with a considerably detached gaze, as if he were not looking at himself but rather at a lump of rotten meat.
Regarding his own bodily condition, Hyuga Yu had long harbored conjectures in his heart, and this type of situation also possessed a specialized term within the shinobi world to define it—Kekkei Genkai Disease.
In the original work, there were two people who directly manifested a Kekkei Genkai disease: Kimimaro Kaguya and Itachi Uchiha.
Kimimaro's pathology was temporarily unclear. It was only known that it severely impacted Kimimaro's actions and life. As he intensified his usage of the Dead Bone Pulse, his vitality and lifespan would drastically deteriorate. The concrete form of manifestation was that the closer he drew to the end of his life, the higher the intensity of his Dead Bone Pulse became. After utilizing the exaggerated scale of the Dance of the Cleaving Seedlings [Dance of the Seedling Fern], he had directly dropped dead on the spot.
What Itachi Uchiha manifested was pulmonary consumption paired with renal deficiency. This bird-brained man's chakra was originally not plentiful to begin with. The consequence brought about by frantically overdrawing his body to use ocular techniques that required massive amounts of chakra was organ failure caused by excessive chakra utilization.
As a medical ninja himself, Hyuga Yu could very easily draw a distinction between these two situations. Itachi Uchiha's case was purely a matter of overestimating his own capabilities. As long as he did not use the Mangekyo Sharingan, his body looked perfectly splendid in every way, and it simply failed to reach the standard of a Kekkei Genkai disease. Or rather, his Kekkei Genkai disease was actually controllable, belonging to a case where he had stubbornly forced himself into ruin.
On the other hand, the bodily problem of Kimimaro Kaguya was a pathology that truly originated from a Kekkei Genkai. This point had begun to manifest ever since Kimimaro was born. During his childhood, Kimimaro could freely manipulate the Dead Bone Pulse, which even adult members of the Kaguya clan found difficult to control.
Furthermore, this sign of precociousness was deemed an easy-to-use tool by the maddened Kaguya clan, who directly imprisoned him to be used as a human shield and weapon.
In essence, this was actually a sign of atavism.
Ever since his birth, Kimimaro Kaguya possessed a Kaguya clan lineage that far surpassed that of ordinary Kaguya clansmen. With this lineage, he had spontaneously awakened the Sage Body belonging to Hamura's line, thereby obtaining the rule-breaking capability of the Dead Bone Pulse.
Yet the essence consumed by the capability of the Dead Bone Pulse—which directly consumed osteoblasts and osteoclasts to form attacks—was vitality. Although the Sage Body possessed an amplification in terms of fundamental vitality, its amplification regarding the specific Kekkei Genkai was even more exaggerated, which consequently led to—
The stronger the vitality, the stronger the Dead Bone Pulse; and the stronger the Dead Bone Pulse, the more vitality it consumed.
Once the consumed vitality exceeded the fundamental amplification of the Sage Body, it would lead the practitioner toward a death spiral where their power grew increasingly formidable, and while their life should originally have grown stronger, it conversely became increasingly feeble.
From this medical perspective, there was actually another shinobi in the shinobi world who was plagued by a Kekkei Genkai disease—
The God of Shinobi, Hashirama Senju.
The vitality of Hashirama's cells was clearly exaggerated to a point that almost bordered on "immortality." Successors who fused with his cells would even experience phenomena of excessive cellular enrichment, leaving them with no choice but to continuously iterate it, resulting in the "eighteenth-hand Hashirama cells" like the one injected into Hyuga Yu.
However, Hashirama Senju, who possessed such powerful cells, did not enjoy a long life. Following his battle with Madara Uchiha, he perished very quickly. Moreover, no matter how one looked at it, Hashirama Senju's Wood Release was exaggerated to a somewhat preposterous degree. Yamato, who had similarly awakened Wood Release, could not even be compared to him.
Fundamentally speaking, this was not a problem with Wood Release. Wood Release was essentially just a type of Kekkei Genkai, and it had not even reached the level of a Kekkei Tota. Yamato's Wood Release was actually the normal intensity of Wood Release.
Identical to Kimimaro Kaguya's issue, what made Hashirama Senju strong was not Wood Release at all, but rather the Senju clan Sage Body that Hashirama himself had awakened, along with the terrifying amplification of Wood Release provided by his secondary Sage Body as the reincarnation of Asura.
Returning to the main topic, Hyuga Yu's current situation was similar to those of Hashirama Senju and Kimimaro Kaguya, yet his pathology was not as absolute as either of theirs. On one hand, the Yang Release nature transformation of Hyuga Yu's body caused his lineage to undergo atavism, reaching a degree of the ancient Hyuga or even surpassing the Hyuga clan. However, the Hyuga clan had not inherited the Sage Body of Hamura's line, so his body only reached a level residing midway between the ancient Hyuga and the Sage Body of Hamura's line.
On the other hand, Hyuga Yu's utilization of the Tenseigan chakra had already surpassed the limit, to the point where he could even unleash an absolute killing move like the Golden Wheel Rebirth Explosion.
Normally speaking, with Hyuga Yu's body, it was fundamentally impossible to sustain his utilization of the Tenseigan chakra. His situation would be analogous to that of Itachi Uchiha, where he would experience premature organ degeneration due to the excessive use of the Tenseigan chakra.
However, the eighteenth-hand Hashirama cells inside Hyuga Yu's body—which had undergone passive amplification via Yang Release—continuously manufactured a colossal amount of physical energy to sustain this terrifying consumption of the Sage's Eyes.
Ultimately, a delicate balance of Yin and Yang was achieved.
Yet as Hyuga Yu's level of mastery over the Tenseigan chakra deepened, once Hyuga Yu mastered the fourth type of Tenseigan chakra nature transformation...
This balance was broken.
Furthermore, the speed of this imbalance would grow faster and faster, faster and faster!
Until it reached a critical point.
By then, Hyuga Yu would be strong to an unbelievable degree, but his body would also fall into a plight identical to Itachi Uchiha's—in fact, it would be even more severe than Itachi Uchiha's.
With Hyuga Yu's own "impoverished" body at the level of the atavistic Hyuga, it was highly probable that the moment he executed a single strike of the Golden Wheel Rebirth Explosion, all of his organs would simultaneously emit the screeching wails of "Danger! Danger!".
At this moment, Hyuga Yu looked at the data on the physical examination sheet, his brows twitching slightly. "If I do not engage in battle, according to this decay rate, the critical point for combat capability degeneration will be ten years from now. However, once I engage in battle, this critical point will arrive rapidly depending on the degree to which the vitality of the Hashirama cells is consumed..."
"To put it another way, which means..."
"With the regeneration power of the eighteenth-hand Hashirama cells inside my body, it can only support me to engage in full-power combat for two more battles before it fails to keep pace with this decay rate?"
Hyuga Yu looked at this physical examination sheet, yet no trace of dread surfaced on his face, nor was there any panic from seeing his impending doom. Instead, the corners of his mouth curled up slightly, and a flash of absolute confidence shot through his eyes. "It is enough!"
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