Reincarated with Nanites

~ Fugaku's Pov, A few hours later... ~

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Argh…"

A dull, throbbing pain spread through my body as I slowly regained consciousness. My muscles ached, my ribs protested, and a faint metallic taste lingered in my mouth.

I blinked, staring up at the darkening sky. The last thing I remembered was—

Hayatou.

I exhaled sharply, forcing myself upright. Stone fragments cracked beneath my shifting weight, remnants of the battlefield where I had lost.

"When was the last time I've been hit like that…?"

I tried to recall, but nothing came to mind. Not since my early days as a shinobi had I felt such overwhelming force. I had faced elite Jōnin, battle-hardened warriors, even other Uchiha with Mangekyō Sharingan—none had ever made me black out with a single exchange.

But Hayatou…

That boy was different.

I replayed the fight in my head, my Sharingan activating on instinct. The moment he disappeared. The detonation of stone beneath his feet. The fraction of a second where my eyes, my three-tomoe Sharingan, had failed to keep up.

That wasn't speed alone. That was something else entirely.

I flexed my fingers, testing my body for injuries. Nothing broken—just soreness, bruising. I had been lucky. Had that last strike landed with full intent, I might not have woken up so soon.

'Damn it…'

I clenched my jaw.

He knew. That entire fight, he had been measuring me... From start to finish, Hayatou was in control. His casual dodges, his precise counters, the way he never looked pressured. He had essentially played with me, just like he had done with Shiba.

And when he finally struck—

I never even stood a chance.

My pride bristled at the thought, but I wasn't foolish enough to deny reality. I had underestimated him. Not entirely, but it was definitely enough.

'He should have been slowed down by my Sharingan... Yet, he wasn't.'

'He should have struggled against my fire jutsu... He didn't.'

'He should have hesitated when I attacked first... Yet, he never did.'

And the worst part? I could feel it... He was still holding back. 

Hrmm... I could see it now, looking back. There was that moment, right before he attacked, where it felt like the boy had calculated the entire outcome already. A moment where he decided to just end it quickly. He could have done far worse to me. And that realization sent a chill down my spine.

A fear I'd only felt of just thinking if my family were to pass before their time... I ran a hand over my face, exhaling through my nose...

This child wasn't just a prodigy. He was something else entirely; he's monster in his own realm. Plain and simple. Strong isn't a word that can describe what that boy is at the moment, or what he will even become.

No clan. No backing. No bloodline. No Kekkei Genkai. Just raw, terrifying talent. Unknowingly, I felt myself letting out a dry chuckle, who wouldn't in my situation...? "To think… a mere civilian, a literal child as well; just knocked me unconscious with ease. It's not even funny."

A shinobi of my caliber, humbled in an instant. I pushed myself to my feet, rolling my shoulders despite the ache I felt. Hayatou, he would likely come for his reward soon—I had no doubt about that.

And when he did… I would have my questions. For now, I'd have to settle with the fact that I would have to teach this boy my clan's techniques, as well tend to the wounds he gave me.

Ha~

I wonder what Makoto will say when she sees me like this?

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~ Hayatou's Pov, the next day...~

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Waking up was the usual routine... Get up. Brush my teeth. Take a bath. Eat five large portions of food.

The standard.

My body felt relatively fine—no soreness, no lingering fatigue. Not surprising. My stamina recovery rate was probably leagues above a normal humans due to how efficient my body was, and I didn't really push myself anywhere close to my limit yesterday. If anything, the fight with Fugaku had still been just a warm-up...

'Am I becoming arrogant?' 

That thought had been in my mind lately. I was pretty powerful at the moment. Powerful enough to over power an Uchiha with his Sharingan active... It felt, almost unreal to me. I was just that strong already.

But, knowing what'll come in the future, I reminded myself that I wasn't that powerful... I'd only be relevant until the Shippuden arc, and that's at best.

[I have finished analyzing the sample you gave me host.]

-Huh!? He's, back?

'N.E.O? I called for you all night? What were you even doing in that time frame?' I was worried about where he had been all night. I'm glad it seems he's done doing what he was doing.

[Processing the Uchiha DNA sample took longer than expected.] N.E.O finally responded, his voice the same as always—calm, still detached as ever, but carrying that ever-present weight... I missed him, even if it was just for a few hours.

[I had to adjust my protocols to ensure the maximum compatibility with your genetic structure.]

I frowned slightly, my fingers tapping idly against my thigh. Maximum compatibility?

'And? What's the result you got back?'

[The results are… intriguing.]

I didn't like how he paused.

'Elaborate for me.'

[Your body is already an optimized human structure—far beyond the genetic baseline of normal shinobi. The Uchiha DNA sample, while formidable, was not inherently that much superior to your current form by itself. However…]

I could feel myself sitting up a little straighter, 'However, what?'

[There is an exception... Your nervous system.]

Oh.. I think I know where he was heading with this...

'My nervous system?'

[Correct... The Uchiha's main genetic advantage is primarily in their ocular and neurological adaptations. Their ability to process visual data at high speeds, greater quality, their enhanced reflexes, their unique chakra interaction with the optic nerves—all of it stems from a highly optimized nervous system and physical parameters.]

That made a lot of sense. The Sharingan wasn't just a pair of fancy red eyes... It was likely a full-body enhancement centered around only better perception, prediction, and reaction.

'And what does that mean for me?'

[It means that your reaction speeds and visual processing can still be enhanced further. The Sharingan itself requires a specific chakra mutation, but your nervous system can still be upgraded.]

I see...

'Upgraded how?'

[Well, I can refine your neural pathways, completely overhauling them using the Uchiha DNA as a template merged with yours—without altering your gains so far... The result would be much faster thought processing capabilities, heightened reflexes, and improved instinctual combat responses.]

So, in other words; I was about to get a real-time buff to my reaction speed and combat instinct—without needing a Sharingan.

'… How much of an improvement are we talking about here?'

[Your estimated reaction time will increase by approximately 439.23%, your reflexes will increase by 348.9% and your thought processing capabilities will be further enhanced by 135.4%]

I froze… That-That was insane!

Currently quintupling my ability to react in a fight? That meant dodging attacks would be nearly effortless to me now. I'd probably be able to perceive, analyze, and counter almost if not instantly... Saying I was excited would be an understatement.

'Alright, but what about the Sharingan itself? Did you get any info about that aspect of their blood?'

[Yes, and not only that; But I can also implement a new function into your body... One that seemed interestingly suppressed in their bloodline.]

Suppressed... Can't say I wasn't interested about that.

'Explain...'

[I will speak about the Sharingan first... When I was optimizing both your genetic structures, I've realized that the capacity of the Sharingan itself seemed to have declined with time, becoming less pure as the generations go by. Interestingly. Fugaku seemed to have a relatively high purity for his Sharingan, strangely enough... I cannot trace back this blood to any origin... It's as if the bloodline traits were removed or have decayed after a few hundred years ago.]

'Hmm... Removed?' I guess genes don't work the same way in this world... That's a damn shame.

[Yes; However, I have can grant you the Sharingan, a much better version than anything shown for the past hundred years, or more... It's quite interesting how inefficient these eyes were when I was studying them when using genetic memories, at least from his bloodline...]

'I'm assuming a change in quality?'

[Yes, host... An interesting change in quality and just efficiency overall. Let's say Fugaku's Sharingan could enhance his own visual prowess by 1, yours can improve your own by a 5...]

"Cough!~ Couch!!~"

"Hayatou, are you alright?"

Crap, "Ah, yeah; I'm fine Mom... Just a bit of a dry throat. It's fine..."

It took me a second to process that... It was that much of a difference? I would practically be in a completely different realm compared to even someone like Fugaku then...

[What's more, is that this would only be the initial stage... The second stage would be a 15, the third a 40, the fourth a 100 and the last would be 300... However, these changes might differ once I gain other genetic samples.]

At this point, I don't think I was even hearing him correctly...

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END