Naruto : I Can Evolve My Gene Infinitely

Rin seized the opportunity without hesitation, extending his spiritual energy through the Sharingan deep into the cell's inner structure. He descended into the core of a hematopoietic stem cell.

Inside, the microscopic machinery of life roared to life in full motion.

Organelles worked like well-oiled engines, unaware of the external gaze.

Chromosomes spiraled like scaffolding, wrapped in a golden haze around telomerase.

A team of Hox gene sentinels examined the blueprint of a newly differentiated cell.

Suddenly—an alarm.

A cancer-associated gene detected a transcription error.

Instantly, a tumor suppressor enzyme sprang into action, severing the faulty DNA strand.

New nucleotides rapidly clustered, repairing the damage by rebuilding the original genetic sequence.

A red blood cell gene chain was successfully synthesized.

Rin stood mesmerized.

The microscopic world unfolded before his eyes like code.

Evolution was a program—flawless, intricate.

To master it was to hold dominion over life itself.

"Hematopoietic stem cells… They only produce blood cells. But could that relate to the Uchiha's inherited power somehow?"

He pushed deeper, observing every cell in the bloodstream, mapping gene shifts and tagging each segment. With the Sharingan, he recorded it all perfectly.

Now that his Blood Shadow ability was at max level, the entire genetic architecture of blood lay exposed before him—transparent, readable.

One thought was all it took to extract and comprehend the meaning of any sequence, as if the knowledge simply downloaded into his mind.

In his past life, he was only a doctor. He hadn't understood this.

Now he could see the function of each gene—how it transcribed, replicated, and formed new cells.

Using this power, Rin discovered something alien.

A gene not native to this body—

The Blood Shadow Gene Fragment.

If he could extract this gene and successfully express it in another subject, that person would gain the same Blood Shadow ability.

More importantly—

If he could isolate the sequence that triggered the evolution to the Mangekyō Sharingan...

Then he could manipulate his own genes to induce a mutation, creating a Mangekyō of his own.

But the process would be slow.

Worse, the Blood Shadow skill could only read and manipulate blood—not other tissues. Still, the discovery was groundbreaking.

He pressed on.

With his remaining evolution points nearly depleted, something else caught his eye.

Unconsciously, his Sharingan activated—three tomoe spinning slowly.

In that instant, the Sovereign of Blood awakened a new truth.

Rin poured the last of his evolution points into the insight forming in his mind.

"So that's it…"

"This… This is the secret of the Sharingan!?"

After a full spectrum analysis of blood composition, Rin confirmed it:

The red glow of the Sharingan wasn't just chakra.

It was biological.

He named it: the Red-Eye Gene.

This gene existed only in Uchiha bloodlines. When activated, it produced specialized "Red-Eye Cells" capable of breaching the eye's membrane and embedding themselves within the optic nerves.

Once there, they fused with spiritual energy to form a unique Yin Release chakra—Dōjutsu power.

When the Sharingan deactivated, these cells receded back into the bloodstream, dispersing throughout the body.

That process allowed Rin to reverse-engineer the Red-Eye gene sequence.

In this world, spiritual energy was tangible.

Only those with high mental strength could wield genjutsu.

This explained why Rin found these cells in both his and Shisui's blood.

Further analysis revealed something terrifying.

Buried deep within the Red-Eye Cells was a dormant program.

If triggered, it would amplify mental energy by over ten thousand times—

At the cost of near-certain blindness.

"Why does the Uchiha bloodline carry such a gene… What kind of ancestral mechanism is this?"

He muttered to himself—then froze.

A memory surfaced.

A forbidden technique of the Uchiha clan.

Izanagi.

Yes—this was it.

The mechanism behind the forbidden Dōjutsu.

Izanagi was taboo.

Most Uchiha couldn't use it, and those who did paid the price of an eye.

In the past, certain rogue Uchiha had used Izanagi to incite internal conflicts, leading to widespread bloodshed.

The clan eventually outlawed the technique.

Rin didn't know it.

So he asked Setsuna directly.

"You want to know about Izanagi?"

Setsuna's brow twitched at the word.

"Where did you hear that name?"

"It's clan-forbidden. You'd do well to stay away from it."

Rin shrugged. "I'm already a rogue. What's there to hide? I'm doing this for research—for the future of the Uchiha. To awaken the true power of the Sharingan—the Mangekyō."

"Izanagi is related to the Mangekyō?"

Setsuna sighed.

"Fine. But you must swear—don't let a single other Uchiha know."

Rin agreed.

And so, Setsuna revealed the secret.

Izanagi was born during the war with the Senju.

Created by an Uchiha ancestor, it used precise hand seals to manipulate chakra and ignite the power in one's eye.

It recorded the current physical state of the body.

Then, once the technique ended, no matter what damage the user took—

Their body reverted to that recorded state.

It looked like time reversal—

But it wasn't.

Armed with this knowledge, Rin returned to his lab, burning with questions.

Did the Uchiha truly wield a power akin to time reversal?

In all of his previous life's memories, no Uchiha had ever displayed such an ability.

Some had space-time jutsu—like Obito, or Sasuke.

But time?

Never.

Rin began to suspect it wasn't time-based at all.

Instead, Izanagi worked through pure spiritual force—altering physical reality through willpower.

Like a wish granted.

A myth-tier ability.

A force resembling what ancient myths would call "The Power of Assumption."