Tobirama Senju's Ninjutsu

Mufeng Uchiha had been using his Shadow Clones to attend school for some time now. He utilized this period to train in ninjutsu, never forgetting to share his power with his counterparts in other worlds.

In a clearing by a small stream in Konoha, Mufeng Uchiha was practicing compound ninjutsu.

"Water Style: Water Wave."

"Lightning Style: Earth Flash."

With Mufeng Uchiha as the center, a massive surge of water erupted in all directions. Simultaneously, the electrical current released by Earth Flash instantly permeated the water. A passing rabbit suffered an undeserved disaster.

Zzzzt—

The rabbit in the grass twitched and collapsed, a faint aroma of roasted meat wafting from its body. Lunch was sorted for the afternoon.

The compound ninjutsu of Earth Flash and Water Wave is only suitable for large-scale hard crowd control. Besides, with my current hand-seal speed, the target would have run away long ago. If only there were another me who could use multiple elements, that would be perfect.

Mufeng Uchiha grabbed the fallen rabbit, processed it simply, skewered it with a sharpened wooden stick, and began roasting it over a campfire after adding seasoning.

"Hmm, not bad. You're full of surprises, Mufeng."

"Kakashi Hatake, just how long have you been watching me? Now that you're here to snatch a student's lunch, it's decided: you're paying for dinner tonight."

Kakashi Hatake gave a wry smile, his sharp eyes sweeping over Mufeng Uchiha. He noticed from the very beginning? What keen perception.

The truth was that Mufeng Uchiha kept Soft & Wet on alert in the surroundings at all times, ensuring every move was under his observation.

While eating the rabbit, Kakashi Hatake handed over all the secret scrolls regarding Water Style he had on him to Mufeng Uchiha. After just one glance, Mufeng Uchiha was captivated by the contents.

"This is impressive, Kakashi Hatake. The research on Water Style ninjutsu here is truly meticulous. I'd bet that just by using these, one could cultivate a Jonin if they found the right person."

"You have a good eye. These are all the notes of the Second Hokage. You must keep them safe."

These were the notes of Tobirama Senju; the handwriting was still fresh, clearly a transcription.

He truly lived up to the reputation of the man netizens joked had signed a contract with the ocean in his previous life. These Water Style hand-seal counts had been simplified, their power elevated by several grades. Some of the ideas for modifying Water Style ninjutsu made his eyes light up; perhaps he could integrate these ninjutsu into Water Breathing.

"I can help you with the training of these Water Style ninjutsu."

How could Mufeng Uchiha refuse such a golden opportunity?

Kakashi Hatake had naturally already mastered these ninjutsu. Under his deliberate demonstration, Mufeng Uchiha quickly mastered them all using the copying ability of his Sharingan.

Water Style: Water Wall, Water Style: Water Prison Technique, Water Style: Water Dragon Bullet.

Kakashi Hatake, who was teaching from the side, watched as Mufeng Uchiha not only mastered the ninjutsu instantly but also showed the ability to draw inferences, even executing the special techniques Tobirama Senju had written down.

The Water Dragon Bullet simplified to three seals, the Water Wall that circled around him like a spinning ring.

Wait, super-strong Water Style talent, keen sensory ability, learning ability that masters it at a glance... damn, isn't this just the Second Hokage reincarnated? And he's an Uchiha? Am I crazy, or is the world crazy?

"Big Brother Mufeng! You really aren't dead! That's great, it's really great! I thought, I thought... sniffle, sniffle."

Naruto Uzumaki suddenly burst out of the bushes and threw himself into his arms. Hey, you're wiping all your snot and tears on me!

"Mufeng, so you were here sneaking extra training with Kakashi Hatake. How despicable," Sasuke Uchiha said indignantly.

The rest of the twelve genin from the class had also emerged from the bushes Naruto had come from. Through the memories transmitted back by his Shadow Clone, he understood the situation.

The sequence of events was that while Naruto was roughhousing with Kiba Inuzuka, he accidentally bumped into Mufeng Uchiha's sleeping Shadow Clone. The clone popped, and Naruto, thinking he had killed Mufeng Uchiha, had been crying in grief.

As for how they found him, Shikamaru Nara, who had been sleeping, couldn't stand Naruto's noisy wailing and revealed the truth. Naruto didn't believe it, so Kiba Inuzuka had Akamaru track him down, while the others followed out of sheer childish curiosity.

"Naruto, get off me."

Mufeng Uchiha peeled Naruto off his body. When he looked back, Kakashi Hatake was already surrounded by Kiba Inuzuka and Sasuke Uchiha.

"The reason they improved so fast is because you're the one teaching them, right? I want to be your student too! I have to defeat that guy, Mufeng Uchiha."

"Hmph, dead last. You can't even beat Naruto and you want to defeat Mufeng? Ridiculous."

Sakura Haruno tried to mediate between the two, Choji Akimichi silently ate his chips, Shikamaru Nara thought it was a drag and wanted to go back to sleep, Ino Yamanaka and Naruto Uzumaki fussed over Mufeng Uchiha, while Shino Aburame and Hinata Hyuga formed a silent duo watching it all.

After the noise died down, Kakashi Hatake walked behind Mufeng Uchiha and patted his shoulder.

"Look, everyone is worried about you. Sometimes life isn't just about training and revenge. Relax a little and go back to the Ninja Academy for class."

"Kakashi Hatake, have you ever experienced having everyone you were close to—the elderly who greeted you, the aunts and uncles who said hello every day, the children playing in the clan grounds, the cries of infants in the houses—all wiped out in a single night? Can you accept that?"

At that moment, Kakashi Hatake saw the raging fire deep within Mufeng Uchiha's Sharingan. This child had buried his hatred deep in his heart, like a volcano about to erupt; once it did, it would be an unstoppable force.

"Everything I cherished has long since been lost."

Kakashi Hatake's face turned sorrowful, as if a painful spot had been touched. In his mind, images of Obito Uchiha under the boulder, the act of killing Rin Nohara with his own hands, and the death of the Fourth Hokage attacked him relentlessly.

"Did the White Fang of the Leaf really commit suicide for such a simple reason? Hasn't Kakashi Hatake ever doubted it?"

Mufeng Uchiha's words clearly caught Kakashi Hatake off guard. Had he not doubted it? It was just that he was unwilling to face it.

After all, his father, whom he had idolized since childhood, the "White Fang of the Leaf" who had made enemies throw down their armor and flee, had actually committed suicide.

"Sigh, teaching people is truly too much of a hassle. I won't try to persuade you to let go of your hatred anymore. If there's time, I'll teach you ninjutsu."

"Kakashi Hatake, you said you were paying for dinner, right?"

"What about it?"

Mufeng Uchiha turned his head and shouted, "Kakashi Hatake is going to treat us all to barbecue!"

Kakashi Hatake was too late to cover Mufeng Uchiha's mouth; everyone was already cheering as they pushed Kakashi Hatake away.

The seeds of doubt had already been sown in Kakashi Hatake's heart, and that was enough.

Looking at the scene, the twelve rookies, the Hyuga Clan, the Ino-Shika-Cho trio, the Aburame Clan, the future Sixth Hokage, the Seventh Hokage—such a formidable network of connections would be no small force in the future. With a little grooming, they might well be used for his own purposes.

For now, he only needed to steadily improve his strength. Once he reached Kage-level, he could venture out ahead of schedule.

The gathering at the barbecue restaurant ended, and with the combined efforts of Choji Akimichi and Hinata Hyuga, Kakashi Hatake's private treasury took a massive hit.

Teacher Kakashi's smile looked worse than crying; he must have been overjoyed.

Exhausted from the day, Mufeng Uchiha collapsed and fell asleep, returning once again to the meeting room, where a burly Mufeng had appeared in one of the seats.

"Transmigrated into the One Piece world, just a lowly soldier in the Navy, and I just received news that Ace has been captured."

Through the shared connection, after understanding everything, he realized that One Piece Mufeng was about to be forced onto the battlefield as cannon fodder.

"A bunch of gods are fighting, how could a lowly soldier like me possibly participate? I haven't even mastered the Six Powers, and I don't know Haki. So, big brothers, please, I want to survive."

One Piece Mufeng was so agitated he was practically ready to hug their legs, his eyes filled with earnest pleading.

"Brother, rest assured. The four of us brothers will work together, so how could we not handle the Summit War? I am about to find clues regarding the Stand Arrow."

"That's right. By now, I have learned so many ninjutsu and the Sharingan; I believe that is enough for you to survive the Summit War."

Hokage Mufeng and JoJo Mufeng encouraged One Piece Mufeng together, while Demon Slayer Mufeng, having just arrived, spoke up.

"Brothers, I am about to participate in the Final Selection. I'm afraid I won't be able to come to the meeting room for some time."

The other Mufengs gave Demon Slayer Mufeng a few words of advice, wishing him luck in hacking the Hand Demon into eight pieces during this Final Selection.