Disclaimer: I do not own Naruto or any of the characters used within the story.

SI fic. No pairings until the MC is physically at least 16.

Prologue

Chapter 1

"Report," Hiruzen ordered the ANBU that stood before him.

"Target has been doing better since his last visit to the hospital," Rat reported. He glanced at the paper once before returning his gaze to the Hokage. "Uchiha-san is also far more mentally stable, is able to sleep better, and does not seem to wake up in the middle of the night since the genjutsu you taught him."

Genjutsu: Dreamless slumber was the Jutsu that Sarutobi had taught to the last loyal Uchiha within the village walls. A Jutsu used by war veterans along with those who had been plagued by mental trauma, was a frequently used Jutsu by shinobi's throughout the elemental nations. It allowed military soldiers to be more productive during wartime, keeping them sufficiently resilient both mentally and physically.

Hiruzen remembered when Itachi's younger brother had begged him to teach a sleep-inducing genjutsu...

Flashback:

"I can't SLEEP! My head hurts, I can't even think straight!" The child in front of him practically yelled at him. Normally the God of shinobi would not tolerate such disrespect from any of his soldiers, but the child in front of him was an entirely different matter. He had experienced what no human should've ever had the displeasure to endure.

The 7-year-old once again locked eyes with him, red eyes with two commas present in each of them. He fell onto his knees and clasped his hands in front of his chest like a worshipper and practically begged him, "Please teach me a jutsu that could make it go away... PLEASE! I can't stand it anymore!"

Hiruzen couldn't think of any child who he had failed more than Uchiha Sasuke.

End Flashback

Sarutobi shook his head, dismissing the rather jarring memory from surfacing again. He could've done more, no rather he should've done better. Instead of letting the Uchiha get more and more isolated due to his friend's (could he even call Danzo a friend? The man had hidden so much from him) machinations, he had bent over like a slave and allowed the man to continue doing his work for the 'betterment' of the village. Although Danzo's ROOT was useful in keeping outside threats from the village, it still didn't change the fact that the man's only solution to prevent the near-inevitable civil war that would have risen was genocide.

"The subject also seems more mature and intelligent than he was before the massacre," Rat's voice broke him out of his thoughts after a few seconds of deliberation.

"Please do elaborate," The Hokage ordered his masked subordinate.

The ANBU operative cocked his head slightly before continuing, "Uchiha Sasuke seems to be more focused now. He can cook, clean, and manage himself far better than any child for his age should be able to. He spends his time either running, stargazing, practicing already learned skills, or sleeping."

That was... interesting to say the least. At least it solved the troubles of not needing to help the child to take care of himself. If anything, maturity beyond the years was a good sign. If the last scion of the Uchiha continued progressing at the rate he was now, Hiruzen had seen in the handwritten report, he was bound to become S-rank. The fact that he had achieved the second state of the Sharingan at the mere age of seven was a bonus.

The Sandaime hated being a pragmatic person but had Itachi not forced his brother to endure the nightmarish jutsu of his, Uchiha Sasuke wouldn't have been so focused. A horrible truth, but a truth nonetheless. Konoha could scavenge something from the carcass of the Uchiha.

"Currently the subject is reading a book on chakra control and is attempting to do the tree walking exercise with near success." Rat continued his report, breaking the Hokage from his thoughts.

"I see," he replied to the ANBU in front of him. The incident had completely traumatized and forced the child to grow. He hoped it wouldn't lead to something too dangerous. "Continue observing him and report any unusual behavior."

With a crisp 'yes', Rat left with his subordinates to continue his assigned tasks leaving Hiruzen with his paperwork and regrets.

Xxx-WiT-xxX

The armor-clad ninja stared at me dispassionately. "By all means flee, cling to your wretched life... and when you possess the same eyes as me... come and face me."

Each word was said to me in a cold and emotional less tone, like I was nothing but an ant to this mass murderer, that I was nothing but a worthless loser beneath his feet.

"ITACHI!!!" I screamed his name like both a curse and a blessing. He was a murderer, a brother, a ruthless monster, a kind person, a.. a.. a...

I woke with a leap, Sharingan spinning to assess the threat in front of me. Instead of finding my psychologically insane brother, I came face to face with a sunlit windowsill that was way too bright for its own good.

I sighed and dropped my hands to my sides. "One day," I murmured. "One damn day I forget to use the genjutsu taught to me by the Hokage, and the Itachi-induced nightmares rise once again."

It had been about a month since my rather gruesome death at the hands of a car. The person that had been driving the BMW couldn't much older than 18 and was without a dumbass drunk driver. At least my death had been quick with only a moment of immense pain, nothing too bad, right? Right?

But no, of course, I couldn't die peacefully. Instead, I had been thrown into the body of one Uchiha Sasuke, the deuteragonist, a survivor of Itachi's murder frenzy and Indra reincarnate. One of the worst and best people to reincarnate into.

My first thought was to kill myself and end my life, it's not like I haven't died already. But then I realized that it would be useless since I had already died, who's to say after committing suicide I wouldn't end up being isekai'd into an entirely new anime world that I'd probably be unfamiliar with?

I had woken up in a hospital with two nurses checking on my condition, making sure I was stable- physically at least. Once I had been confirmed fit enough to leave the hospital, I had then come face to face with the Third Hokage, arguably among the top ten strongest ninjas that were not born with a Kekkei Genkai. The old man had greeted me with a smile that looked very real and sincere, however, in a world such as the Narutoverse, emotions could be faked easily. To put it simply, I did not trust that man one bit.

Despite having a rather fierce reputation, in my opinion, the God of Shinobi was nothing but a pushover. The man had done nothing to prevent the massacre of Uchiha, instead bending over to the whims of his cynical counterpart, Danzo Shimura. Honestly, Hiruzen was like an NTR hentai protagonist, except he's the one getting cucked in the relationship.

Once the questioning from the dangerous old geezer had been completed and I was deemed to be ready to go, I headed straight back to the Uchiha compound to familiarize myself with the place regardless of having ready-made memories from the previous owner of this body. The problem with those memories is that I could feel the pain, the grief of losing the family members I never had. In each corner, I could visualize certain members of Sasu-no not Sasuke's, mine. I reminded myself. I could visualize members of my now dead clan in every empty house.

I was now Sasuke Uchiha, everything that had previously belonged to him was now part of me. All those clan members that had died, even those that I hadn't personally known was engraved into my head. Itachi had made sure I remembered every single member of the now dead clan by forcing his Tsukuyomi upon me.

I had been given a month of probation time to allow myself to get used to the Uchiha compound, without the Uchiha clansmen in it of course. I was way too exhausted mentally to even care about anything once I had reached my house. As soon as my head hit the pillow I was asleep, in under a second. I was hoping for a night of good long sleep for my sanity until I discovered one huge problem. Itachi fucking Uchiha induced nightmares.

I couldn't sleep because of the nightmares that plagued every corner of my head and after 1 or 2 days of sleepless nights, I went and begged, rather pitifully, to the Hokage, to teach me something that would make the horrific sights go away, at least for the nights. I needed time to process the absolute hell I had been thrown into.

I had gotten the genjutsu down in about an hour or so. The memories of the old Uchiha Sasuke certainly helped in that endeavor. Learning Genjutsu: Dreamless slumber was the absolute best decision I could've ever come up with. It certainly helped keep my sanity intact by allowing me at least peaceful moments during the night. No more Itachi fucking Uchiha induced nightmares. Yay.

Once I had a feeling that I was slightly more mentally stable and my tears of grief for both my past life and my future had subsided, I realized I needed to plan. Uchiha Sasuke had a lot of enemies that included the likes of Orochimaru, Kabuto, Danzo, Itachi, Obito, Zetsu, Madara, etc. Seriously amount of maniacs in this world was downright impressive.

To put it simply I had come up with one plan, a simple one: get stronger or die trying.

As mundane as it sounds, it really was the only way. I already had the Sharingan - a very useful tool in the long run - one of the most OP Kekkei Genkai to ever exist. It was the only good thing to have come out of the Itachi fucking Uchiha induced nightmares.

I'd come up with plans to defeat Orochimaru or Obito along the way but for now breakfast, the most important meal of the day.

Thank the lords my mother from my previous life had practically shoved cooking lessons down my throat. Never know when you're going to get isekai'd into an anime world.

Xxx-WiT-xxX

Umino Iruka heard about the Uchiha massacre. Of course he had, after all who hadn't? The clan had been one of the founding fathers of Konoha and rivaled the Senjus in power. Their famous dojutsu, the Sharingan was undoubtedly powerful, capable of forcing an opponent in a visual genjutsu with mere eye contact.

The once great clan had been reduced to two living members, Itachi Uchiha the kin-slayer and Sasuke Uchiha his younger brother. Iruka may not have been overly fond of the prestigious clan, but he would've never wished total genocide, by one of its members no less.

Before the massacre, Sasuke hadn't been something special. Sure he did well in most subjects, but he wasn't as good as his brother and seemed to have a playful side as well. The child was happy to get praise from his elder brother. Iruka had seen the blushes Sasuke would portray on his admittedly cute face whenever his brother poked his forehead. And to one day wake up to the man you look up to the most murder everyone you loved in cold blood... the academy Sensei couldn't even fathom living with that.

So Iruka was silently and rightfully relieved when the last loyal Uchiha entered the classroom, but there was a change. You could feel it with the way the boy walked and the way his eyes swiveled to take note of everyone in the classroom.

The cheerfulness was gone from the boy's face. It was now replaced with calm indifference. Sasuke's clothes remained the same, a black turtleneck with an uchiwa fan embedded in the back, white shorts, and blue sandals.

The 7-year-old locked gazes with him. "I am back sensei," the child informed him calmly. Iruka almost flinched at the flat tone the boy conveyed the message to him, but that was expected. No one would remain the same after experiencing what the boy had.

Offering the child a sincere smile or at least what he hoped was sincere, Iruka motioned Sasuke to go to his usual seat.

The boy nodded before proceeding to do exactly what he had advised him to do. Sasuke's gaze was now focused firmly at him, blank and flat.

A slightly unsettling prospect but Iruka moved on with the lesson.

Omake:

Hiruzen couldn't think of any child he had failed more than Uchiha Sasuke.

The Sandaime frowned when the whiskered visage of a blonde boy popped in his head. He scoffed when he realized he had no idea who that was. It's not like it mattered right? After all, if something was unknown to him, it didn't matter much did it? He was the Hokage after all, such things were trivial to him.

And with those thoughts, Hiruzen continued his paperwork.

AN: Decided to dabble into SI fics since I enjoy reading them a lot.

Also, Hiruzen neglects Naruto, a classic.

Constructive criticism (that includes grammar, spelling, etc.) is highly appreciated. Try not to be too offensive though.