One Day, I Will Break the Seal...

Si-Wei-Shen-Hai-Wu-Yin.

That was...

After one clash, Kagami Uchiha's hands flew through hand seals, startling the teacher into shouting.

"All students!! Scatter!!!"

Kakashi's pupils shrank as his own hands moved swiftly.

"Fire Release—Great Fireball Technique!"

"Earth Release—Earth Flow Wall!"

The Great Fireball Technique, as the signature jutsu passed down through generations of the Uchiha Clan, was widely known across the Ninja World.

Almost every Uchiha learned the Great Fireball Technique as their first jutsu.

Having heard from Obito that Kagami Uchiha could use Fire Release, Kakashi assumed he knew the Great Fireball Technique, so he began his counter the moment Kagami started forming hand seals.

Boom!!

The ferocious fireball shattered the earthen wall!

Kakashi had made the right call, but underestimated the power of Kagami's jutsu.

"Damn it!"

The chunin teacher sensed danger and used the Body Flicker Technique to try and save Kakashi.

Bang!!

Before the wave of flames even reached him, Kakashi's body burst into a puff of smoke, leaving only a charred log in its place.

Substitution Technique!

When did he...

Bang!

Kagami turned and crouched, meeting Kakashi's fist as he emerged from a hole in the ground.

Fierce taijutsu combat resumed.

"This... this is already a real fight between ninjas..." muttered Obito, forgotten in the corner, his eyes filled with disbelief.

And a hint of resentment.

The Uchiha Clan valued martial prowess, and he often heard clan members praising Kagami. When their gazes fell on him...

Nohara Rin offered timely comfort, patting Obito's shoulder and smiling. "Obito, you're great too. I believe you'll become an amazing ninja someday!"

"Yeah!"

The gloom that had just risen in Obito's heart was dispelled by the girl's smile.

So, Uchiha Madara really did judge people well. If Nohara Rin had lived, Obito would never have awakened the Mangekyo.

You really should thank Lord Madara for that blessing, Obito!

"Earth Release—Earth Wave!"

For someone his age, Kakashi's chakra reserves were already far beyond the norm.

This was a lesser version of the Earth Flow Wave technique, and the ground rippled like waves, disrupting Kagami's movements.

"Among those under ten who have fought me, Kakashi, you are the strongest."

Kagami leaped between the waves, a faint smile never leaving his face.

"But I've grown tired of this game."

"Your purity is still lacking."

The moment the words fell, a flash of crimson reflected in Kakashi's eyes.

A terrifying blood-sea demon crashed into his mind, instantly paralyzing both his body and spirit.

Genjutsu: Sharingan—Sukuna Special Edition.

The Double Tomoe Sharingan slowly emerged in Kagami's eyes as he stepped closer to Kakashi.

His hand rested on the hilt of Sode no Shirayuki.

Slap!

The teacher's hand landed on his shoulder, voice trembling slightly. "Enough... you win, Kagami."

He looked down and saw the crimson in Kagami's eyes, swallowing hard.

He had indeed heard that the Uchiha Clan had a prodigy who awakened the Sharingan at age five... but to awaken with Double Tomoe!

Or perhaps he awakened even earlier... and evolved to Double Tomoe by five.

Either one was terrifying enough.

The entire venue fell into dead silence.

Watching Kagami Uchiha locked in fierce combat with Kakashi, they had considered the possibility that Kagami might win, but still...

They had absolutely no idea how Kagami Uchiha had won!

It wasn't until Kagami swept his gaze across the crowd, and that crimson light fell upon their eyes.

Even the children knew what this was.

One of the three great dōjutsu, the ultimate manifestation of the Uchiha Clan...

The Sharingan!!

Kagami Uchiha was quite satisfied with the awe in these brats.

That's right, the Uchiha didn't need any bonds; you only needed to grovel and look up to me.

Even without using the Sharingan, he was confident he could defeat Kakashi.

But why hide it?

A person's character is shaped by environment, education, and other factors, but there's also an important part... the body.

Bad lungs make you prone to sadness.

A bad liver makes you prone to irritability.

A bad stomach makes you prone to complaints.

The Uchiha have good brains, so being a bit arrogant is only normal!

Parading in brocade at night—that would be turning into Uchiha Fugaku.

What shaped Kagami Uchiha's personality included the influence of the Uchiha genetic factors, but the main thing was his own mindset.

In his past life, he had no parents, no relatives, no friends. If he hadn't been born in modern times, in ancient times he would have been a key target of concern, groomed into a death warrior.

And here...

The sea ends at the horizon, where the sky becomes the shore.

I stand atop the mountain's peak, the summit beneath my feet!

The crimson faded from his eyes, and Kagami Uchiha said flatly, "My name is Kagami Uchiha. I hate reckless challenges, I hate being disturbed during meals, and I hate Uchiha Obito."

"That's all."

Uchiha Obito: "..."

--

In the Hokage Office, the smoke density had exceeded the limit.

Sarutobi Hiruzen stared at the scene in the Crystal Ball, his brow deeply furrowed.

This child... needs proper guidance.

He summoned his secretary and said in a low voice, "Jiraiya has been teaching Minato lately, hasn't he?"

"Yes, Lord Hokage. They are currently training in the Forest of Death."

After a moment of deliberation, Sarutobi Hiruzen thought it over carefully and decided not to act too quickly.

Let the child stay in the Ninja Academy for now. Perhaps interaction with his peers could change his personality.

If that didn't work, then let that little sun shine on this Uchiha brat.

In Minato, Sarutobi Hiruzen saw a light that could unite everyone—a radiance even more dazzling than his ninjutsu talent.

--

If not for his performance on the training ground, Kagami Uchiha would have seemed far more well-behaved than Obito.

During class, he didn't cause a ruckus or sleep.

Though when the teacher called on him to answer questions, he ignored them anyway.

Kagami Uchiha had long since mastered everything the Ninja Academy had to offer. Not just water-walking and tree-climbing, he was nearly done with the clan's curriculum on Chakra Shape Manipulation.

The limit of Chakra Shape Manipulation was the Rasengan. He wondered if Namikaze Minato had figured it out yet.

This was also the current challenge Kagami Uchiha had to tackle. He had complete step-by-step lessons and could reverse-engineer from the standard answer.

If he could use it before Namikaze Minato, then the Uchiha Clan would be the legitimate originator of the Rasengan.

Namikaze Minato?

If you weren't Jiraiya's disciple, I'd dare to sue you for plagiarism!

Of course, all of this depended on Kagami Uchiha being the first to develop the Rasengan.

Kagami Uchiha sat quietly, his consciousness already sinking into the Mental Space.

Before the massive gate, Kagami Uchiha sat down and began to train.

The Rasengan has three stages: "Rotation," "Power," and "Maintenance."

Kagami Uchiha was currently stuck on the third stage.

The Rasengan was like a small typhoon gathered in the palm, and the hardest part was maintaining that state.

"Brat... what the hell is going on outside... and what's with those eyes of yours..."

The Sharingan Genjutsu infused with Sukuna's Cursed Energy was an experiment Kagami Uchiha had tried.

The effect wasn't bad—if the Head Instructor hadn't intervened, Kakashi could have stood there until morning.

And this also let Sukuna sense a bit of the outside situation.

Chakra was a perfect fusion of Spiritual Energy and physical energy, while Cursed Energy originated from negative emotions, merely one type of Spiritual Energy.

In Sukuna's view, almost every brat outside had Cursed Energy!

He could even sense several powerful Cursed Energies not far away, on par with top-tier Cursed Spirit Users.

This density of strong individuals was too abnormal...

Most importantly... this was the first time he had directly experienced Kagami Uchiha's eyes.

Though he didn't think they could harm him right now...

To use an analogy, he was like a wild bull, and the Sharingan represented a lion... no, a dragon egg was a more fitting comparison.

He had a vague premonition that if these eyes hatched from their shell, they could effortlessly shatter his immortal body!

In a spare moment, Kagami glanced at him and said flatly, "That's why it's so annoying."

"Other people either get a cheat code handed to them on a silver platter, or they have a system issuing quests. And here I am, stuck with just you—something that's neither here nor there."

"Brat! What did you say!!"

"Quiet down, Sukuna."

"This world is far more dangerous than you imagine. Creatures that can kill you are everywhere. Put away that unnecessary recklessness of yours."

"Behave and listen to me, and maybe you'll get a chance to appear as my Summoning Beast."

Sukuna roughly guessed the meaning of Summoning Beast, and his icy voice rang out: "Before reaching the pinnacle of the world, I don't care about groveling either."

"Compared to me, you're the one who doesn't know the immensity of heaven and earth, brat. With such paltry power, you dare to expose yourself before other strong beings."

"I'm not like you."

A smile tugged at the corner of Kagami's lips, and the chakra sphere in his hand showed a hint of stabilizing.

"If I die, it just means I was nothing more than that."

"I won't be like you, begging for mercy just to survive."

His crimson eyes met the god of slaughter lurking in the darkness.

"I clearly know how insignificant I am. Does that mean I have to shrink back?"

"Doing what you know is impossible, Sukuna—you've already lost the most important instinct of a human. You're just a somewhat powerful beast."

"So you can only be a mount, one that I will ride!"

"Brat, you're just an ordinary man using this unknown cage to bind me. Stop spouting such nonsense."

Kagami leaned close to the seal, a slight curl to his lips.

"Sukuna, one day, I will open the seal..."

"And put a Dog Leash on you."