All Of The Worlds Will Be Mine

The field stretched out before them like a gentle sea of green.

Soft, damp grass covered the training ground, glistening faintly under the light of the rising sun. Tall trees bordered the clearing on three sides, their branches arching overhead, forming natural shade like a quiet forest cathedral. The rustling of leaves in the morning breeze blended with the chirping of birds—serene, almost sacred.

Renji inhaled deeply.

This was one of Uzumaki Village's oldest training grounds, designed primarily for physical conditioning. There were no flashy dummies, no chakra-enhanced targets, no elemental testing stones—just space. Open, honest space for the body to run, leap, and grow stronger.

It was almost completely empty now.

Too late for the early risers.

Too early for the evening warriors.

Perfect for them.

Elric was already off like a shot, sprinting across the field like a red blur. His laughter echoed faintly as he made loops around tree trunks and tried to race his own shadow.

Renji smiled faintly, then took a step forward—

And froze.

His chest tightened.

Thump.

His heartbeat spiked suddenly, sharp and unnatural. His breath caught mid-inhale. The world tilted just slightly. His legs, though steady, suddenly felt as though they stood on ice. A cold sweat formed at the base of his neck.

His scalp prickled.

The hair on his entire body stood on end.

It was like… something was watching him.

Something ancient.

His head turned sharply, scanning the trees, the grass, even the sky. For just a breath of a second, it felt like the entire world had gone silent.

And then—

It was gone.

The sensation vanished without a trace, as though it had never been there at all.

His heart slowed. The dizziness faded. The air smelled normal again.

"…What was that?"

Renji's brows furrowed.

That oppressive, suffocating pressure. That weight. It hadn't been chakra… no, it was something deeper. Something that didn't belong in this world. His instincts screamed at him like they hadn't in years. Something was wrong.

A bad feeling twisted in his chest.

But before he could dwell on it any further—

"Dad! What are you doing?!" Elric's voice called from across the field, full of energy and innocence. "Come on! Hurry up!"

Renji turned his head.

His son was waving both arms, impatient as ever, already bouncing in place like a coiled spring.

The unease still lingered in the back of his mind.

But… he forced it down.

It's probably nothing. I'm just overthinking it. It's just another day.

He took a breath, forced a smile, and stepped onto the field.

....

Isshiki Ōtsutsuki.

A name once spoken across galaxies with awe and terror alike.

A being who had turned worlds into dust, who had driven entire civilizations to extinction. Who had consumed chakra fruits from ten thousand planets and crushed rival Ōtsutsuki with nothing but contempt in his heart.

At least… that's who he used to be.

A thousand years had passed since the peak of his reign.

He stood now upon a planet shaped by the corpse of a god.

Earth—once the sealed body of Shiva Ōtsutsuki, a celestial who had ascended and abandoned his physical form, locking it away with the divine force of Chibaku Tensei. That divine husk had become the core of this blue planet.

A convenient prison.

Isshiki's black eyes narrowed.

This world… this cursed place.

He remembered it vividly.

A millennium ago, he had arrived here with a subordinate—Kaguya Ōtsutsuki. Nothing more than a low-class servant. A weakling, as far as the hierarchy was concerned. A caretaker meant to support his mission. Every high-level Ōtsutsuki had one. She had merely been assigned to him.

And yet—she had dared.

Just as he prepared to devour the chakra fruit of this planet, just as everything was aligning—she attacked.

From behind.

A betrayal so deep, so sudden, so effective… it nearly killed him.

Half his body—obliterated.

His divine form, shattered.

He had no choice but to flee, to find a "suitable" host and survive in disgrace. That host body had been acceptable. Barely. But it was frail. Mortal. If he dared to use even a fraction of his true strength, it would collapse.

And the worst part?

The worst part?

That lowly servant—Kaguya—ate the fruit herself.

One single fruit.

One.

And she surpassed him.

It was infuriating.

He had consumed ten thousand chakra fruits—harvested over centuries, stolen from worlds that would never see their stars again.

And she—she dared to become stronger with only one.

Where was the justice in that?

Where was the fairness?

He clenched his fists, his divine chakra surging like the silent roar of an invisible sun.

And yet… he could not make his move.

Not yet.

Not until he found a new vessel.

A perfect body.

One that could bear the weight of his power without turning to ash.

Isshiki narrowed his eyes.

He had waited this long.

He could wait a little longer.

....

Back in the training field, Elric sneezed.

Renji blinked. "Are you catching a cold?"

No.

"Never mind that. Let's warm up. First round—tree dodging."

"But the trees aren't attacking."

"Don't worry. I am."

"…Wait, what?!"