The System Finally Appears

Rain Village.

Inside the black tower.

The rain outside the window fell without end.

Uchiha You stood by the window, a wisp of black-red chakra slowly pulsing in his palm like a breathing source of infection.

This was one of the reasons he now dared to stride unhindered through the ninja world.

His left eye held the Black Umbrella, Pathogen Dominion.

His right eye held the White Umbrella, Cellular Reconstruction.

One eroded his enemies.

One strengthened himself.

In a one-on-one fight, he could wear down most opponents of the same level.

In a group battle, he could turn the entire battlefield into a contaminated zone.

But even so, Uchiha You knew perfectly well.

The Mangekyō Sharingan was not limitless, after all.

The stronger its power, the greater its price.

Eyesight.

Pupil power.

Mental strength.

Chakra.

Every use of the Mangekyō meant trading the future for the present.

That was why most members of the Uchiha Clan throughout history who awakened the Mangekyō eventually went blind or died.

It was not because they were not strong enough.

It was because those eyes themselves were a curse.

Uchiha You slowly closed his eyes.

A faint burning pain came from deep within his eye sockets.

Ever since leaving Konoha today, he had used the Mangekyō too many times in succession.

First, he killed three Root members.

Then, he killed Juzo Biwa.

After that, he fought Kisame Hoshigaki.

And just now, he had forcibly endured Pain's Almighty Push and established his dominance before Pain, Konan, Sasori, and Kakuzu.

It had felt great.

But the drain had been very real.

If he had possessed an ordinary Uchiha Mangekyō, using it like this would have ruined his eyes in two or three months, let alone half a year.

Uchiha You raised a hand to rub his brow and muttered softly:

"So, I still need to solve the problem with my eyes as soon as possible."

The moment he finished speaking.

A cold, mechanical voice suddenly rang out in his mind.

[Ding!]

[It has been detected that the host has officially intervened in the Akatsuki's main storyline faction.]

[It has been detected that the host has altered the prerequisite events of the Uchiha Massacre Night.]

[It has been detected that an important plot character, Kisame Hoshigaki, has shifted factions.]

[The Behind-the-Scenes Final Villain System has officially activated.]

Uchiha You froze.

It had finally come.

There was not much surprise in his eyes. Instead, he seemed to have expected this all along.

In truth, from the very first day he had transmigrated into this world, he had sensed that something was hidden deep within his body.

It had been waiting all this time.

Waiting for him to truly embark on the path of changing the plot.

Until today, when he killed Juzo Biwa, recruited Kisame, entered the Akatsuki, and successfully persuaded Nagato, Konan, Sasori, and Kakuzu.

The original Naruto storyline had begun to veer completely off course.

Only then had the system truly awakened.

The corners of Uchiha You's lips curled upward slightly.

"The Behind-the-Scenes Final Villain System?"

"The name does fit my situation rather well."

[This system is designed to assist the host in becoming the ultimate hidden ruler of the Naruto world.]

[The host may obtain Behind-the-Scenes Points by changing the plot, controlling factions, defeating important figures, and altering the fates of important characters.]

[Behind-the-Scenes Points may be used to strengthen pupil power, restore eyesight, deduce plans, exchange for special abilities, and adapt bloodlines.]

Uchiha You's gaze shifted slightly.

Just as expected.

The reason he dared to use the Mangekyō so freely was not simply because he was reckless.

It was because he had long sensed that the dormant power within him could slowly repair damage to his pupil power.

Before the system fully activated, he could only passively enjoy part of its effects.

Now that the system had officially awakened, many things had finally been laid bare.

The next instant, a translucent panel appeared before him.

[Host: Uchiha You]

[Age: Sixteen]

[Bloodline: Uchiha Clan]

[Eyes: Mangekyō Sharingan]

[Left-Eye Pupil Technique: Black Umbrella: Pathogen Dominion]

[Right-Eye Pupil Technique: White Umbrella: Cellular Reconstruction]

[Susanoo: Initial Stage]

[Current Behind-the-Scenes Points: 18000]

[Current Main Quest: Uchiha Massacre Night Countdown]

Uchiha You narrowed his eyes slightly as he looked at the panel.

"Eighteen thousand Behind-the-Scenes Points?"

"Looks like what I did these past few days was worth quite a lot."

The system's voice continued.

[The host killed Juzo Biwa, changing the Akatsuki's member composition, and gained 3000 Behind-the-Scenes Points.]

[The host recruited Kisame Hoshigaki ahead of schedule, changing Kisame's faction allegiance, and gained 5000 Behind-the-Scenes Points.]

[The host persuaded Konan, changing the Akatsuki's internal structure of trust, and gained 3000 Behind-the-Scenes Points.]

[The host reached a cooperation agreement with Nagato, changing the Akatsuki's course of action, and gained 5000 Behind-the-Scenes Points.]

[The host influenced Sasori and Kakuzu's later choices of action, and gained 2000 Behind-the-Scenes Points.]

Uchiha You nodded.

Reasonable.

Though he had not truly invaded Konoha yet, the chessboard had already begun to change.

The Akatsuki's original pace of action had been forcibly shifted ahead by him.

Kisame had not been won over by Obito first.

Konan and Nagato had learned ahead of time that Danzo had been involved in Yahiko's death.

Sasori and Kakuzu had also been tempted by Konoha's interests.

These changes were enough to pry loose the events that followed.

Just then, the system's voice rang out again.

[First-stage main quest issued.]

[Quest Name: Prevent the Uchiha Massacre Night.]

[Quest Content: Prevent the Uchiha Clan from being exterminated, preserve the Uchiha's core fighting strength, and settle accounts with the masterminds behind the Uchiha Massacre Night.]

[Quest Objectives:]

[One: Shisui Uchiha survives.]

[Two: Itachi Uchiha must not carry out the extermination plan.]

[Three: The Uchiha Clan's casualty rate must remain below ten percent.]

[Four: Kill or completely cripple Danzo Shimura.]

[Five: Destroy Root's core structure.]

[Quest Reward: Eternal Mangekyō Sharingan.]

[Additional Reward: Issued according to completion rate.]

Uchiha You's breathing paused slightly.

The Eternal Mangekyō.

This reward was exactly what he needed most right now.

The Mangekyō was powerful.

But its side effects meant it could not be used at high intensity for long periods.

The Eternal Mangekyō, however, was entirely different.

Not only did it eliminate the side effects of pupil techniques, it could also allow the Susanoo to truly advance into its mature stage.

More importantly, the Eternal Mangekyō granted by the system would not require him to take the eyes of a relative.

That spared him the greatest moral and practical trouble.

Uchiha You said quietly:

"What form will the Eternal Mangekyō take?"

[The Eternal Mangekyō will fuse the system-provided uranium-core pattern with the host's original Protective Umbrella Mangekyo foundation.]

[Post-fusion pattern: The outer layer will bear black-red Protective Umbrella pathogen markings, while the inner layer will display the uranium-235 fission symbol.]

[Symbolism: The union of biochemical calamity and nuclear fission authority.]

[New ultimate pupil technique of the Eternal Mangekyō: Uranium-Core Temporal Shift.]

Uchiha You's gaze suddenly sharpened.

Uranium-Core Temporal Shift?

The name suited his own remarkably well.

"Specific ability."

[Uranium-Core Temporal Shift: Uses the Eternal Mangekyō's pupil power to interfere with the target's cellular rate of time, thereby altering the target's physical age.]

[It may rejuvenate or age the target, or temporarily adjust the host and target to a particular bodily state.]

[This ability may be used on the host, enemies, and allies.]

[Cost: Extremely high chakra consumption.]

[Restriction: The stronger the target, the smaller the possible age alteration and the shorter its duration.]

[To permanently alter a target's age requires an enormous amount of chakra and Behind-the-Scenes Points.]

A sharp glint flashed through Uchiha You's pupils.

Changing age.

At first glance, this ability did not seem as direct as Amaterasu, Tsukuyomi, or Kamui.

But in reality, it was absurdly powerful.

A ninja's strength was inseparably tied to their physical condition.

Youth.

Peak condition.

Old age.

Childhood.

Each stage possessed entirely different combat power.

If he forcibly aged a Kage-level expert by several decades, even for only a few minutes, it would be enough to reverse the course of a battle.

If he rejuvenated an enemy into childhood, reducing their chakra reserves, physical strength, and reaction speed, then no matter how strong they were, they would instantly lose their advantage.

And what if he used it on his own people?

For example, Tsunade.

For example, Nagato.

If he could forcibly pull their weakened states back to their prime, that would be a strategic-level ability.

Of course, the cost would be a massive amount of chakra.

That was perfectly reasonable.

Time, age, cellular flow—these concepts were inherently outrageous.

It would be abnormal if there were no cost.

But for Uchiha You, this restriction was not impossible to solve.

In the future, there would be Hashirama Cells.

There would be tailed-beast chakra.

There would be the Uzumaki Clan bloodline.

With Akatsuki's resources.

As long as he obtained the Eternal Mangekyō Sharingan, this ocular technique would become the key to truly stepping into the Super Shadow tier.

Uchiha You slowly let out a breath, the excitement in his eyes vanishing in an instant.

"System."

"How much longer can my Mangekyo Sharingan hold out?"

[Based on the host's current frequency of use, without the system's buffer, vision will noticeably deteriorate within three months.]

[Since the system has been activated, Behind-the-Scenes Points can be consumed to repair eye-power damage.]

[Currently available function: Eye-Power Maintenance.]

[For every 1,000 Behind-the-Scenes Points consumed, one instance of moderate Mangekyo Sharingan deterioration can be repaired.]

Uchiha You smiled.

Eighteen thousand Behind-the-Scenes Points.

That was enough for him to splurge for quite some time.