After careful consideration, you chose the two left-eye Kamui with the highest quantity, one Amaterasu, and two Kotoamatsukami stolen from Danzō.
A total of five Sharingan to use as experimental material.
Everything was ready.
You took the initiative to separate a clone with only Uchiha blood and no eyes.
Using medical ninjutsu, you implanted one Kamui and one Kotoamatsukami into its eye sockets.
Once you sensed that the clone's eyesight had fully recovered and successfully accepted the Ocular Power—
It was time to cancel the separation and initiate reintegration with your main body.
At first, the fusion went perfectly. After all, the body originated from you.
However, the moment it came to merging the Sharingan, problems began to surface.
Since the Sharingan cells weren't originally yours, the fusion triggered a cellular conflict: your Six Tomoe Sharingan began clashing with the Kamui and Kotoamatsukami eye cells, the powers trying to devour each other.
Thankfully, your Sharingan had long surpassed the Three Tomoe stage. Even Mangekyō Sharingan were suppressed by your current eyes.
After sacrificing a portion of your Ocular Power, you managed to eliminate the cell activity of the other two eyes and absorb their remaining Ocular Power.
Yet, despite this—
You felt no signs of actual fusion.
When you opened your eyes, aside from the blurriness from excessive Ocular Power loss, there was no new eye technique in sight.
Let alone the fabled Eternal Mangekyō Sharingan with its inexhaustible power…
Fortunately, as someone with an Ōtsutsuki body—blessed not only with Uzumaki lineage but also with Wood Release bloodline almost as dense as Hashirama Senju's—recovering your Ocular Power was merely a matter of time.
After a few weeks of rest, your Ocular Power returned to full.
And that's when you noticed—though the fusion had failed to grant you any new eye technique, it had strengthened your Ocular Power's cap and intensity.
Maybe the Hyūga clan's ocular fusion technique had played a role here, you mused.
Still, if merging Mangekyō Sharingan only slightly increased your Ocular Power capacity… that would be an unforgivable waste.
So, you refined your approach.
This time, you brought out one Kotoamatsukami and one Amaterasu again for fusion.
But this time, your plan was different: you would first deplete the Mangekyō Sharingan of their power—this would reduce their resistance during the merging process.
Less resistance meant less energy loss during absorption—and a higher chance of capturing the eye techniques intact!
Just as expected, the clone implanted with Mangekyō Sharingan relentlessly cast Amaterasu's black flames and Kotoamatsukami on the "Tailed Beast Absorption Array" until its vision teetered on the brink of blindness.
At that point, you initiated fusion again.
This time, there was virtually no resistance.
Your Six Tomoe Sharingan's Ocular Power easily infiltrated the two Mangekyō Sharingan and began scouring within for traces of eye techniques.
You even burned through a massive amount of chakra, calling upon a wisp of formless Void Rule to assist you in deciphering the very essence of these techniques!
Finally, after several twists and turns—
With most of your chakra drained and your Ocular Power nearly depleted—
You managed to locate the eye technique hidden within the Amaterasu-imbued Mangekyō, guided by your acute sensitivity to Fire Release.
Using the last of your strength, you dragged it into your own eye, sealing it to prevent it from dissipating or escaping.
Under the saturation of Ocular Power, the technique slowly began to merge with your Six Tomoe Sharingan.
Success!
You could feel it—after fusing with Amaterasu, your left eye was undergoing an earth-shattering transformation.
Unfortunately, you were a step too slow with the right eye. When you tried to capture Kotoamatsukami's technique, you failed to sever its link to the original Mangekyō in time.
Once the Mangekyō's Ocular Power ran dry, the eye technique naturally collapsed…
Still, though you didn't gain Kotoamatsukami—
Amaterasu alone was enough to bring visible change to your eye.
You calmed your mind and focused, allowing the transformation of your left eye to proceed naturally.
And waited for the fusion to complete…
...
One month later, you opened your eyes again.
At this point, Amaterasu no longer required sealing techniques to remain stable—like a native eye technique, it coexisted within your eye without the slightest rejection.
This marked true fusion.
Even though both eyes had merged with two Mangekyō Sharingan apiece and received equal boosts in Ocular Power—
Your left eye clearly felt different.
"Amaterasu."
A mass of jet-black flame ignited in midair, warping and folding space itself with its scorching heat.
With a thought, you withdrew the flames instantly.
"Looks like my Amaterasu also includes the function of Kagutsuchi. And although my left eye hasn't become an Eternal Mangekyō Sharingan after the fusion, I can feel my Ocular Power limit continuing to rise!"
You searched your memory—and finally recalled a result from one of your past Simulations.
That time, you obtained a manuscript from Uchiha Setsuna.
In it, Setsuna described a process of forcibly merging two basic Three Tomoe Sharingan with sealing techniques—resulting in a natural breakthrough and gradual growth in Ocular Power.
Setsuna believed this method could push ordinary clan members' Sharingan infinitely close to Mangekyō level.
That led you to suspect: perhaps your Six Tomoe Sharingan is growing for the same reason.
Furthermore, you realized something strange.
Your left eye already housed Amaterasu and your own base power—
By all logic, it should've evolved into an Eternal Mangekyō Sharingan, fixing your Ocular Power at its peak.
Which should've made further fusion impossible.
But now?
Your left eye not only continued to grow naturally, just as it did before you even awakened the Three Tomoe stage—
It still held the potential for future fusion!
After some reflection, you arrived at a conclusion:
The fusion process you used didn't replace your eye—it absorbed the eye techniques and Ocular Power instead!
Not to mention, the Mangekyō you fused were originally just Three Tomoe, completely inferior to your Six Tomoe Sharingan.
On top of that, you used the Hyūga clan's ocular fusion technique—not the Uchiha clan's traditional eye replacement surgery!
With all these factors combined, you had paved a path for your Sharingan unlike any other.
"If I continue fusing… or if enough time passes… maybe I really can break through the limits of the Sharingan—and increase the number of Tomoe again!"
You thought to yourself.
Just three more Tomoe…
And your eye would become a Nine Tomoe Sharingan.
At that point, it couldn't possibly remain just a Sharingan—it would reach the realm of the Rinnegan-Sharingan!
The Rinnegan requires the powers of Indra and Asura to awaken. But the Rinnegan-Sharingan? That monster ignores all logic.
It's the ultimate power brute-forced into existence!
Sure, thinking you could reach that realm just by fusing a few Mangekyō eyes sounded like a pipe dream…
But right now, you were more convinced than ever—
This was the true evolution path of the Sharingan!
----------------
Pls Drop some Power Stones
+100 chapters and support me on Patreon(.)com/Jixo