Reborn in Jujutsu Kaisen as a Zenin

A mother's gentle hand stroked her son's hair as he slept peacefully in his bed.

To any observer, it would appear a tender moment between parent and child - the love between Kaori Itadori and her four-year-old son, Yuji, evident in the softness of her touch.

But behind Kaori's loving gaze existed a consciousness far older than her thirty-year-old body suggested.

A mind that had witnessed the rise and fall of civilizations, that had inhabited countless vessels over more than a millennium of careful planning.

I, Kenjaku, had chosen this form with specific purpose. The female vessel suited my current needs perfectly. It has been a while since I've taken a female's form - even though I originally was a woman myself, having lived so long as men, makes even me have to adjust.

No matter though, it is the perfect necessity - being a loving mother above sall uspicion, with access to the most precious experiment of my extended existence.

Little Yuji stirred slightly in his sleep, his remarkable physical capabilities already evident even at this young age.

Such strength in a child so young was no accident, but the culmination of centuries of planning, accelerated by an unexpected opportunity.

The emergence of Indra Zenin had changed everything.

When I first sensed his presence fifteen years ago, I recognized something unprecedented in my millennium of existence.

His cursed energy existed at the very boundary of jujutsu's laws - not merely powerful, but fundamentally different.

He sat at the edge of the established order, as if partially outside the constraints that governed all other sorcerers.

This quality was precisely what I had sought for centuries.

The greatest challenge in my research had always been the immutable law of soul manifestation.

Heaven decrees that when a child forms in the womb, a soul manifests simultaneously - no delay, no exception.

This fundamental principle had frustrated my attempts to create the perfect vessel for Sukuna's return.

I had developed elaborate binding vows and techniques to circumvent this law, but all proved insufficient. The constraints were too deeply embedded in the fabric of reality itself.

Then Heaven smiled upon my endeavors by presenting Indra Zenin. His unique nature offered the key I had sought for centuries.

Acquiring his blood had been a stroke of extraordinary fortune. During his earliest trial, when Naobito threw the young Indra into the well of curses, I had agents positioned to collect any biological material that might emerge.

A few precious drops of blood were recovered from the well's edge - the only time Indra Zenin ever bled, as far as my extensive surveillance could determine.

The relief I felt at procuring even that small sample was immeasurable.

That blood contained the essential element for my breakthrough - genetic material from a being who straddled the boundary between established jujutsu law and something... beyond.

Combined with Jin Itadori's DNA - a distant descendant of Sukuna's bloodline I had tracked for generations - it created the perfect vessel for the King of Curses himself.

But with a crucial difference from my previous attempts.

Indra's borderline existence provided the component that allowed me to bypass Heaven's decree, creating a vessel that could contain Sukuna while maintaining a measure of control over the process.

His DNA, existing partially outside jujutsu's fundamental laws, created microscopic "gaps" in the soul manifestation process - infinitesimal moments where I could insert specific parameters before Heaven's automatic assignment could occur.

The result was young Yuji - physically capable of housing Sukuna's immense power, but spiritually engineered to resist immediate domination.

The vessel's soul - being Sukuna's twin and being influenced by Indra's borderline existence, would force even the King of Curses to negotiate rather than simply overwhelm.

This control mechanism was essential. Sukuna unrestrained would simply destroy everything, including my carefully laid plans.

I needed his power, his knowledge, but contained within parameters I could influence.

Yuji's uniquely engineered soul would provide that containment, allowing me to incorporate Sukuna into my designs without being overwhelmed by his chaotic nature.

I gently pulled the blanket higher over Yuji's shoulders. My role as his mother provided the perfect cover to monitor and guide his development.

Unlike my previous vessels, I had chosen to maintain this one's original personality as much as possible. Kaori Itadori's maternal instincts served my purposes better than any fabricated behavior could.

Rising quietly from Yuji's bedside, I moved to the study where my latest project awaited. The Special Grade curse I had constructed was performing exactly as designed, sowing precisely calibrated fear through Kyoto's population.

The screens before me displayed multiple camera feeds - some from public security systems I had accessed, others from my own discreetly placed observation points.

The curse moved with mechanical precision, delivering its message about the Sons of Heaven to carefully selected civilians.

"The First Son of Heaven returns. The Second and Third herald his awakening. The world will burn anew."

Simple, dramatic, and perfectly crafted to create the exact narrative I required.

The international jujutsu community was already responding as predicted - with fear, suspicion, and increased scrutiny of Japan's Sons of Heaven.

The Council of Earth's formation had been an unexpected but useful development.

Their fear of Satoru and Indra provided excellent cover for my own operations, directing attention exactly where I wanted it while leaving my true activities unnoticed.

Opportunism has always been my strength. When the universe presents an opening, I seize it without hesitation.

The Council's emergence, Indra's unique nature, the international tensions - all pieces I could incorporate into my grand design.

My fingers moved across the keyboard, adjusting parameters for the curse's next appearance.

Its construction had been one of my more elegant achievements - a perfect blend of modern technology and ancient cursed techniques, designed to appear as a conventional Special Grade while incorporating capabilities no natural curse could possess.

The disappearing ability that had confounded Kyoto's sorcerers was particularly satisfying. Not true teleportation, but a partial dimensional shift I had refined over centuries of experimentation.

The curse existed simultaneously in multiple planes, able to shift its soul - its primary manifestation between them at will.

A notification appeared on one of my screens - Jujutsu High was deploying a special team to Kyoto.

The roster confirmed my expectations: Satoru Gojo, Indra Zenin, Suguru Geto, and Masamichi Yaga.

The Sons of Heaven themselves, walking directly into my carefully prepared scenario.

Perfect.

I smiled as I finalized the curse's instructions for their arrival.

This confrontation would serve multiple purposes - testing the Sons of Heaven's capabilities, advancing my narrative about Sukuna's return, and most importantly, gathering data on Indra Zenin's technique.

Of all the pieces on the board, he remained the most enigmatic.

His crimson technique defied conventional analysis, suggesting properties that shouldn't be possible within established jujutsu frameworks. Understanding it fully was essential to my plans.

A soft sound from the hallway drew my attention. Yuji had awakened and now stood in the doorway, rubbing his eyes sleepily.

"Mama? What are you doing?" he asked, his voice carrying that innocent curiosity that made maintaining my maternal facade surprisingly pleasant.

"Just some work, sweetheart," I replied, instantly adopting Kaori's gentle tone. "You should be sleeping."

"Had a dream," he mumbled, approaching to lean against my leg. "About a man with marks on his face. He was fighting."

I kept my expression neutral despite the significance of his words. Dream connections with Sukuna typically didn't begin until the vessel was much older.

For Yuji to experience them at four suggested an unusually strong resonance - a testament to the effectiveness of Indra's borderline existence in facilitating the connection process.

"Just a dream," I soothed, stroking his hair. "Let's get you back to bed."

As I carried him back to his room, I contemplated the accelerated timeline his development suggested.

The properties in Indra's blood had proven even more effective than anticipated, creating a vessel whose connection to Sukuna was forming years ahead of schedule.

Once Yuji was settled back to sleep, I returned to my work with renewed focus. The Special Grade curse would need to perform perfectly tomorrow.

Its encounter with the Sons of Heaven needed to yield specific results - enough to strengthen the narrative I was creating, while providing the data I required without revealing my involvement.

The screens before me displayed the current positions of Jujutsu High's team as they prepared for deployment.

Satoru's distinctive cursed energy signature flared occasionally, visible even through standard monitoring techniques.

As I prepared the final instructions for tomorrow's encounter, my thoughts kept returning to Indra Zenin.

His existence had become something of an intellectual fixation for me over the years - a puzzle unlike any I had encountered in my millennium of life.

What exactly was he?

The question haunted me with increasing intensity. I had observed countless sorcerers throughout history, documented every variation of cursed technique, studied the emergence of rare phenomena like the Six Eyes.

Yet Indra defied all established categories.

His cursed energy didn't merely exist at the boundary of jujutsu's laws - it seemed to selectively acknowledge those laws, as if they were suggestions rather than immutable principles.

In my extensive observations, I had noted moments when fundamental jujutsu principles simply... failed to apply to him. Not through technique or binding vows, but as if by his very nature.

I opened a secure file on my computer - one of many dedicated to analyzing Indra's existence.

The blood sample I had acquired during his well trial had yielded fascinating but incomplete data.

Its properties were unlike anything in my extensive records, suggesting cellular structures that shouldn't be possible within normal biological parameters.

Could such an existence be replicated? The question had consumed hundreds of hours of my research time.

When creating Yuji, I had deliberately set parameters to prevent him from inheriting Indra's borderline nature.

Such unpredictability would have compromised my control over the vessel. Yet I couldn't help wondering what might have happened if I had allowed that inheritance to manifest fully.

Would Yuji have developed the same selective relationship with jujutsu's laws? Would he have existed partially outside the established order?

The possibilities were tantalizing, yet too risky for my primary experiment.

But what of other potential descendants? If Indra were to have children through conventional means, would they inherit his borderline existence?

Was this the beginning of a new evolution in sorcerer development - one that might eventually produce beings who existed entirely outside jujutsu's constraints?

The implications were staggering. Throughout history, sorcerers had evolved in predictable patterns, their techniques becoming more refined but still operating within established frameworks.

Even Sukuna, for all his overwhelming power, still functioned within the fundamental laws of jujutsu.

Indra suggested something else entirely - not just an evolution of power, but a potential evolution of existence itself.

I accessed another file, this one containing theoretical models for what I had tentatively labeled "post-jujutsu existence."

If beings like Indra represented an evolutionary step, what might the next step look like? What might exist beyond the boundary where he currently stood?

These questions had practical implications for my plans.

The merger with Tengen was designed based on my understanding of how cursed energy and human consciousness interact - an understanding that Indra's existence called into question.

If the fundamental laws I had built my plans upon were not as immutable as I had believed, adjustments might be necessary.

I had attempted to gather more biological samples from Indra over the years, but opportunities never materialized.

After the well incident, his control became absolute. He never bled, never left behind hair or skin cells that could be collected without detection.

The single vial from his childhood remained my only physical evidence of his unique nature.

I have considered seduction. DNA is after all DNA, no matter the fluid.

But the problem with it is the fact that Indra seems to have only have eyes for the Ten Shadows girl. 

I could possess her, her technique is significant enough for it to be a worthy act.

Though I would have to establish a binding vow that at least temporarily hides me from his awareness, for he would not be fool enough not to question the stitches, nor the feel of my cursed energy.

In the end though I decide that such a thing can wait for later. Perhaps after I incarnate Sukuna fully.

I closed my files and prepared for sleep, knowing tomorrow would bring new discoveries.

My plans were flexible, adaptable - they had to be, to survive a thousand years of changing circumstances.

As Kaori Itadori, I would sleep beside my son, the vessel engineered with Indra's blood.

As Kenjaku, I would dream of boundaries transcended, of laws rewritten, of existence itself reshaped by the knowledge I sought to obtain.

The anticipation was almost sweet in its intensity - a feeling I had almost forgotten after centuries of calculated patience.

Tomorrow couldn't come soon enough.

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(Author note: Hello everyone! I hope you all liked this chapter from the creepy 1000 year old evil sorcerer's pov.

So, yeah, she's obsessed.

And yes, she.

I find it rarely done for Kenjaku to be a female and find an interesting concept.

As well have I heard that Kenjaku's speech patterns in Japanese sound like a grown up women.

So have decided to go with this. Hope you all don't mind.

Also yeah, Yuji. See, I have always wondered how in the hell Kenjaku even caused a reincarnation. Was it all luck or was it aritificial? We got no explanation just that Kenjaku did.

So, knowing that Kenjaku is quite the opportunistic person, with using Geto, and Mahito who she couldn't prepare for in the manga -

well at least Geto, Mahito could have been possibly intentional the existence of, I thought it reasonable to go against Heaven's laws by using the blood of the Sovereign.

So yeah, again I hope you enjoyed, and I hope to see you all later,

Bye!)