As early as in the previous life of Uchiha Yue, scientists had already established that human emotions are intricately tied to hormonal secretions within the body.
Whether it's joy, sorrow, hatred, or even love—each can be manipulated by adjusting the hormonal balance, such as dopamine, serotonin, adrenaline, and cortisol.
In other words, if a person's body is incapable of producing these essential neurohormones, then that individual would be emotionally numb—no sadness, no rage, no compassion—a machine in human form, not unlike a cold, lifeless puppet.
Now, using this scientific principle as a foundation, Uchiha Yue, through the application of his Parasitic Puppet Technique developed in the illusion world, was able to overlay complete control over his subjects' bodily systems, including their hormonal secretions.
Naturally, this allowed him to manipulate specific hormone levels within the three selected Uchiha clansmen—driving their emotions to targeted extremes.
In essence, the so-called Emotional Guidance Technique was, in truth, a sophisticated hormonal modulation operation, hidden beneath the spiritual veil of genjutsu and illusion.
But while the principle sounds straightforward, implementing it on a human body without adverse effects required an intimate understanding of anatomy, chakra circulation, and the biological underpinnings of the ninja system.
That was precisely why, despite thinking of this method immediately after recovering his past-life memories and designing his own Mangekyō awakening blueprint, Yue had to abandon it initially. His understanding of shinobi biology was too shallow back then to guarantee safety or success.
But now, things had changed. Yue had the Illusory World as his training ground, had become Patriarch of the Uchiha, and had accumulated an immense cache of resources and personnel—including medical-nin and anatomical scrolls from the Nara and Yamanaka clans.
Thus, the method he had once shelved was revived and put into practical experimentation—he was ready to test whether Mangekyō could truly be induced artificially.
Time ticked forward with quiet intensity.
Under Yue's manipulations, the levels of noradrenaline and cortisol in the trio's bodies spiked dangerously. Rage clouded their judgment. Their tempers boiled to a fever pitch, and their bloodlust teetered on the brink of madness.
If Yue hadn't used the Parasitic Spore Binding to restrict their motor functions, they might have already torn one another apart like berserkers.
And yet—even with rage reaching peak levels, their Sharingan only spun faster within the three-tomoe pattern, but never evolved into Mangekyō.
"What's the issue here? With this intensity of emotion, the evolution should have triggered already. Why are they stalled?"
"Moreover, this method—unlike foreign genjutsu—is driven by their own hormone-triggered emotions. It mirrors the spontaneous outburst I used to reach my Mangekyō. There's no rejection or external interference involved. Logically, it should work!"
Watching their expressions twist in barely contained fury, and noting that their bodies were already displaying signs of hormonal overstimulation—dilated pupils, overheating, microtremors—Yue's brows furrowed. Something was off. He began cross-referencing his own breakthrough moment in search of clarity.
"Could it be… belief? When I awakened my Mangekyō, I had already imagined the kind of power I needed. I had built that conviction over time. Even as grief and pain overwhelmed me, I clung to that desire. That clarity, that purpose, became the soul of my Mangekyō."
"But these three—while talented and well-trained—seem to lack that same foundational will. They feel anger, yes, but it's scattered, unfocused. They don't yet know what they want. Without a firm ideology, their emotions lack the depth required to catalyze true transformation."
Mangekyō, the Spiritual Mirror Eye, was never just an upgrade of the Sharingan—it was a personalized manifestation, each pupil technique born of its wielder's innermost soul.
Before Mangekyō, the Sharingan was a bloodline-locked tool with limited variance. But once it crossed that threshold, its evolution became a reflection of self—of trauma, desire, conviction. Without a mental blueprint, the transformation couldn't be triggered, no matter how powerful the emotional stimulus.
"You three—think of the fallen Uchiha! Think of our brothers and sisters massacred by Konoha's betrayal. Are you not furious? Do you not crave the power to rise against that injustice?"
"Don't suppress it. Release your anger. Turn it into fire. Turn it into the power that will burn down every enemy who sought to chain the Uchiha name."
Realizing their bodies couldn't sustain the current hormonal overload much longer, Yue activated his Eternal Mangekyō Sharingan, infusing his voice with subtle genjutsu and suggestion, gently steering their unchanneled wrath into focus.
Under his mental pressure and guidance, the trio's chaotic rage sharpened. The fog in their minds lifted. Their fury locked onto a single vision—vengeance against the enemies of the Uchiha.
And with that focus came a seismic shift.
Their Three Tomoe Sharingan, which had plateaued despite constant rotation, suddenly synchronized. The tomoe blurred into a circle, then morphed—each into a unique kaleidoscope pattern.
Their souls ignited. Their chakra flared.
"—Success!"
Seeing the three Mangekyō awaken in unison, Yue's eyes lit up. A rare smile played on his lips.
To nurture three Kage-level dojutsu users was a monumental step. It altered the clan's future trajectory and his own power structure as its patriarch.
"Master Patriarch!"
Now empowered by Mangekyō-level chakra, the trio's control over their own anger strengthened. They could suppress the mental corrosion more effectively, just as Itachi had done after his awakening.
"Good. You've stabilized, but your physical conditions remain volatile. Let me rebalance your internals first."
Satisfied but cautious, Yue began extracting the surplus hormones using his Spore Channeling Technique, carefully adjusting blood chemistry and regulating chakra flow.
Then, he used the regenerative abilities stored in the spores—similar to Hashirama's passive healing—to repair cellular stress.
Finally, he removed the spores entirely with a swift surgical seal, restoring them to their base physical state—only now with Mangekyō Sharingan embedded in their eyes.
"Thank you, Patriarch!"
Though they had trusted him, even welcomed the spores, the relief they felt at their removal was palpable. They bowed respectfully.
"Good. Congratulations on unlocking Mangekyō. This is a great honor—and a great burden."
"You've likely felt some new ability stir within your vision, yes? If you're comfortable sharing it, I may be able to help you refine or understand it. Of course, if you prefer to keep it private, I won't press. After all, Mangekyō abilities are often one's greatest trump card."
His gaze swept across the trio, each with a unique pattern now swirling in their pupils. He kept his tone calm and respectful—this was not a demand, but an offer, backed by his own experience and understanding of dojutsu.
JOIN MY PATREON TO READ ADVANCE 30+ CHAPTERS
Patreon.com/Kora_1