As an Uchiha I became the Jinchuriki of Senju Tobirama

Shisui looked at Kazuki with an expression of begging for praise. He hasn't even turned six yet this year!!

Konoha's current top genius Hatake Kakashi also graduated at this age.

The genius of the Uchiha clan, the main goal of his life is not to be inferior to others!

Kazuki patted his head to encourage him and said: “It’s just special grilled fish. If Shisui wants to eat it, your brother can make it for you whenever you want…”

Shisui smiled contentedly, a look of joy on his face.

However, Kazuki’s gaze turned serious. He coughed softly and said firmly: “Why do you want to graduate early?”

Shisui was surprised at first, and noticing Kazuki's seriousness, he looked away uncomfortably. "Ninja school... Ninja school has nothing to teach me."

Hearing Shisui's hesitant answer, Kazuki sighed slightly. "Shisui, can't you tell the truth to your brother..."

The disappointment in his tone instantly made Shisui panic.

"That's not the case, brother!" Shisui pursed his lips, and after a moment, he whispered: "I am a genius of the Uchiha clan, so I want to do my part for the relationship between the clan and the village."

“If I can match the speed with which Kakashi-senpai rose to Chunin and become one of the village’s most prominent talents, I will be able to attract the attention of the higher-ups in the village and the clan.”

“Then, perhaps I can act as a bridge to resolve the tensions between the village and the clan properly and peacefully…”

Hearing these words, even Tobirama inside Kazuki couldn't help but nod his head.

Looking at Shisui's childish face, Tobirama hummed in confusion.

Kazuki laughed silently. As expected, always wanting to take responsibility for everything with the attitude of a genius.

Kazuki likes this younger brother very much.

Shisui truly loves Kazuki, even though the original body's talent is surprisingly poor and, being part of the Uchiha clan, he couldn't even graduate from ninja school at the age of eleven…

Still, Shisui respected him deeply, seeing him as his spiritual pillar and his most beloved person.

"Shisui, you are still a child, and this kind of pressure and responsibility should not be borne by you." Kazuki tapped Shisui's forehead. “You are just a five-year-old child. What can you understand? You are just a naughty child.”

“Stay in ninja school for now. The things you think are the responsibilities of adults like me.”

Shisui smiled foolishly, but his gaze became somewhat wandering.

Although Shisui tried to hide his thoughts, Kazuki could still sense what he was thinking.

To be honest, if it was the combat power of the original body, maybe four or five of him would not be able to beat the six-year-old Shisui.

Even if Shisui respected and loved his brother, he would still believe that in the world of shinobi, where strength is paramount, a shinobi without power can do nothing.

“Shisui, it’s been a while since we practiced together, how about we do it now?” Kazuki sighed softly. “Let your older brother, who is the last in the ninja school, see the power of our little genius.”

“If you can’t beat me, then you’re still a brat who only wants to eat grilled fish.”

Shisui narrowed his eyes instantly.

As an Uchiha, although Shisui has a very good temperament, he cannot tolerate his strength being questioned, even if the one questioning him is his older brother.

"Brother, if you lose, you have to make me whatever I want to eat for the next week."

"Okay." Kazuki nodded with a smile. "Let's go to the training ground left for us by grandpa."

Hearing the word grandpa, Shisui's eyes suddenly became firm. That was exactly the ninja he wanted to be.

So he thought to himself: 'I'm sorry, brother. This time, I won't hold back. I need to use my strength to get the attention of all the clan members. I'll start by convincing you.'

...

Kazuki and Shisui were separated by a great distance on the training ground.

While Shisui was dressed in a formal combat suit, Kazuki was still in his casual clothes, watching Shisui with a smile.

Tobirama was silently watching everything from inside Kazuki.

Looking at Shisui from Kazuki's perspective, Tobirama narrowed his eyes.

Shisui's aura, almost six years old, already surpassed that of most ordinary Chunin.

For someone like Tobirama, who has seen countless people, if Shisui continues to grow, even without awakening the Mangekyo Sharingan, he will be a powerful Kage-level shinobi.

“The potential and danger of the Uchiha clan, tsk…” Tobirama thought of Shisui’s older brother and muttered.

The simple Shisui did not know that his good brother had imprisoned his grandfather's teacher whom he admired in his body...

“Brother, be serious, I’m going to attack.” Shisui looked at Kazuki, who seemed relaxed, and thought to himself: 'If my brother is determined to compete with me, he's probably also doing it to find a way out…'

'Rather than holding back like usual, giving my best is the best respect I can show my brother.'

Shisui's gaze suddenly became firm. In an instant, he took out six shuriken and threw them forcefully towards Kazuki, making a cutting sound.

However, they were not aimed at the vital points.

“How considerate of you, Shisui. Are you still afraid of hurting me?” Kazuki smiled gently, only making two seals…

Spiraling walls of water rose around him, blocking all of the shuriken.

"Water Release: Water Formation Wall!"

Tobirama's pupils shrank suddenly.

Did he release the Water Formation Wall with just two seals?

Moreover, this Water Formation Wall is not just a flat wall, but a three-dimensional defense, which demands a high level of chakra control.

Isn't this my technique?!

[From the target Senju Tobirama, you obtain the Sensing Technique (Senju Tobirama version)]

Kazuki slightly raised the corner of his mouth.

This was the reason why he didn't block Tobirama's perception.

Facing Kazuki, Shisui rubbed his eyes in disbelief, as if he couldn't recognize his brother.

Simplified Seal, Water Release Rank B…

How can this be a laggard who can't graduate from the ninja school!

"Brother, you..." Shisui looked at Kazuki in shock, and after a moment, he suddenly laughed. "You are worthy of being my brother, you really gave me a surprise..."

"Then, I will also use my full strength!"

Shisui activated his Sharingan, a tomoe in one eye and two tomoe in the other.

Shisui doesn't know what happened to Kazuki.

In his memory, Kazuki is a gentle and even a little weak Uchiha.

Although he has little talent, he is willing to help others and is very affectionate with him.

Cook for him, buy new ninja tools and snacks, listen to his troubles, and recently tell him interesting bedtime stories.

In Shisui's view, Kazuki is the best brother in his heart even if he has no power.

Now, Shisui was shocked. Could it be that his brother, who had always been so silent, was a genius?

However, in Shisui's heart, Kazuki was the brother he was supposed to protect.

At that moment, the competitive Uchiha lineage and the desire to protect his brother were unleashed in Shisui, who revealed his ace up his sleeve.

At less than six years old, he had already awakened the Sharingan, and one of his eyes even had two tomoe!

"Brother, you know how much power these eyes contain..." Shisui said, his eyes glowing a deep red, making his normally sweet face turn somewhat sinister.

Kazuki was a little surprised. He didn't know that Shisui had opened the Sharingan, but he still smiled and nodded, and said softly: "Sharingan, the foundation of our Uchiha clan's pride in the shinobi world."

"It has the three abilities of observation, copying, and hypnosis."

Shisui raised his head proudly. "So, brother, surrender to your younger brother!"

Shisui's eyes shone brightly as he activated his favorite illusion technique. All of his ocular power was focused on the technique he was about to use. But before he could launch the technique, Kazuki's eyes closed.

Seeing Kazuki close his eyes, Shisui shook his head a little sadly, thinking: 'I'm sorry, brother. Even if you hide so much power, without the Sharingan, you won't be able to defeat a genius like me...'

While Shisui was internally lamenting for Kazuki, the latter performed several seals at high speed.

Suddenly, complete darkness enveloped Shisui's vision, interrupting his complicated thoughts.

"Bringer-of-Darkness Technique!"

Kazuki slowly opened his eyes and explained to his brother with a smile: "This technique was developed by the First Hokage in the early days to deal with Uchiha Madara, and then improved by an incompetent Hokage to become a more powerful technique..."

"It's an A-rank genjutsu that even three-tomoe Sharingan take time to undo, because it incorporates some sealing techniques."

Shisui used all his strength to activate his Sharingan but could not see through the darkness in front of him.

Tobirama had no time to care about Kazuki's secret criticism of him. It felt like a heavy stone was pressing down on his heart.