Izuna Uchiha's Frustration

"Just a casual glance and I found six unnecessary and useless nodes, wasting 30% of my Chakra for no reason! 30%!" He was both amused and exasperated, his headache only worsening with each glance.

Was he in a hurry back then? Or was he just trying to get by? How could he dare to throw such a flawed technique into the battlefield and harm people?

The worst part is that, a century later, I still have to clean up his messes, stuck in the lab Tenten revising his lousy work, so exhausted I don't even have time to catch my breath!

Behind the lab bench piled high with petri dishes, Caesar Clown peeked out and whispered to Vallen beside him, "Tobirama Senju... who is this guy? He's really something, able to anger Izuna Uchiha to this extent."

Vallen shook his head slightly, unaware of this.

Judging from Izuna Uchiha's resentful expression, one could guess that the other party was definitely a veteran powerhouse from Madara's era, with whom Izuna Uchiha had a deep-seated grudge. The Forbidden Technique that was tormenting Izuna Uchiha to the point of working overtime was the work of that person.

Caesar Clown sullenly shrank back, clutching the cold petri dish and muttering under his breath, "For someone to hold a grudge against Izuna Uchiha- senpai for so many years, and to be able to keep complaining about him, this person must be a rather formidable character."

At the laboratory entrance, Natsu stood quietly by the door frame, her hands tucked into her sleeves, observing with a knowing smile in her eyes.

He knows Izuna Uchiha too well; the more scathing his criticisms, the more reliable he is when it comes to getting things done.

During the Sengoku period, everyone called Izuna Uchiha a "ninja without weaknesses," but few people knew that his most unbeatable Dōjutsu was not the Mangekyo Sharingan, but his almost perverse talent for disassembling and modifying.

Any Ninjutsu, Taijutsu, Genjutsu, or even top-tier secret Swordsmanship, once he has seen them or fought with them once, he can instantly see through their underlying logic, expose all their hidden flaws, and then personally dismantle and reconstruct them, polishing the original techniques to perfection.

Now that this Impure World Reincarnation is in his hands, it has been stripped bare, leaving him with nothing but his underwear.

He meticulously eliminated the redundant nodes left by Tobirama, and reorganized the entire Chakra transmission chain with almost obsessive attention to detail.

What appears to outsiders as tedious patching and repair is, to Izuna Uchiha, more like having his technical skills repeatedly crushed and humiliated by Tobirama Senju across a century.

Despite their constant complaints and criticisms, they genuinely strive for excellence and never slack off.

Natsu knew perfectly well that the best strategy now was to keep quiet and watch the show, without interrupting.

Izuna Uchiha vented his anger, and the optimization progress in his hands skyrocketed.

But if I were to say something inappropriate that would provoke this perfectionist boss, who's already in a bad mood, to throw a tantrum and give up, then I'd be in big trouble.

Delays in progress are a minor issue; if he were to abandon the project, I would have to take over the entire mess of optimizing Forbidden Technique and improving Gene Serum.

It's truly a case of losing more than you gain.

So he stood quietly at the door, adopting the posture of a bystander, eagerly listening to the drama unfold.

Izuna Uchiha took a deep breath, suppressed his speechless feelings, and picked up his pen again to continue working.

The pen tip glides across the paper with such speed that it leaves a trail of afterimages. Each stroke precisely targets the core flaws of the original technique, correcting, simplifying, and reconstructing it all in one smooth motion.

He kept muttering to himself, but his hands were never slow or slacking off.

In less than a month, Tobirama Senju's crude and flawed original Impure World Reincarnation had been iterated and optimized several times, resulting in a comprehensive surge in stability and Chakra utilization.

Even the extraction efficiency of the accompanying Hashirama Cells Gene Serum was significantly increased by him.

Natsu sighed in her heart, "Indeed, the greatest advantage of having Impure World Reincarnation body is that you don't need to rest."

He channeled all his old grievances into incredibly high work efficiency, without having to pay a single penny of overtime pay. He was practically the most conscientious top-tier worker on Origin Island.

He couldn't help but imagine a scene: if he were to encounter the old era again by chance, and Tobirama Senju were to Impure World Reincarnation, he would probably be cornered by Izuna Uchiha as soon as he landed and stood still, and Izuna would criticize him from beginning to end, from the flaws in the technique to the crudeness of his aesthetics, and would be scolded for a whole day.

A smile welled up inside him, but his face remained calm and composed.

Natsu held her slightly cool teacup and continued to lean against the door, watching this arrogant and resentful senior, who, while vehemently criticizing his nemesis's lousy work, diligently cleaned up all the flaws for him.

Natsu slowly walked out of the laboratory, the faint echoes of Izuna Uchiha's complaints about Tobirama still lingered in the deep corridor.

He didn't turn around, but simply shook his head slightly, a helpless yet indulgent smile playing on his lips, and walked towards his own courtyard.

He knew perfectly well that all of Izuna Uchiha's rambling complaints over the past half-day had turned into solid, meticulous optimizations; the harsher the complaints, the more substantial the results.

His thoughts drifted slightly as he thought of the little fellow in the clan recently.

Sasuke recently awakened the Three-Tomoe Sharingan, displaying exceptional talent and standing out among his clansmen.

After being praised and flattered by his Clan Academy for several days, this kid has become increasingly arrogant lately. He walks with his chin held high, and the restlessness in his eyes is almost impossible to hide.

Natsu noticed something amiss during yesterday's routine training.

Sasuke threw his Shuriken, deliberately making an extra half-circle of fancy trajectory. The movements were flashy and exaggerated, pleasing to the eye, but actually useless. It was purely for showing off and impressing everyone.

The Uchiha Clan has never lacked gifted youths, but there has always been a chasm between geniuses and true powerhouses.

That chasm was always filled little by little with daily sweat and humble dedication.

Sasuke is now standing on the edge of this chasm.

Those who achieve fame and power at a young age, without any guidance or restraint, will inevitably fall from grace due to their arrogance.

Since he had some free time today, Natsu decided to personally take action and temper the kid's arrogance, giving him a real-world lesson in combat.

The sunlight was perfect in the courtyard Training Ground, casting dappled shadows on the bluestone ground.

Sasuke was practicing his Shuriken repeatedly in front of a thick wooden stake. The six Kunai evenly fanned in the wood and firmly embedded in the wood. The landing points were precise. Compared to last month, he had indeed made remarkable progress. It was clear that he had put in a lot of hard work in private.

However, his movements as he sheathed his blade and pulled out the kunai deliberately imitated Natsu's Kunai technique, with an extra arc added to his wrist rotation.

What appears elegant and graceful is, in the ever-changing battlefield, a fatal flaw.

That half-second of fancy movement was enough for the enemy to strike first, and a Kunai through his shoulder and neck.

Natsu leaned against the corner of the corridor pillar, watching quietly without saying a word.