One Piece: sign-in to Ryujin Jakka

Boom!!

In the blink of an eye, countless sea creatures—fish, octopi, seahorses, sea snakes, and even several Sea Kings—burst from the ocean's surface like a tide of life!

Creatures named and unnamed, packed densely together, broke through the water's surface one after another, as though fleeing from an unseen force!

At the harbor, Admiral Aokiji stood frozen, drenched in sweat, eyes wide in disbelief.

The sea waves crashed violently, and the sea was in utter chaos!

Crack!

The ice, he had recently formed, had shattered again, swallowed by the rampaging ocean.

Aokiji's lips twitched uncontrollably. "What... what is going on here?! That's the fourth time!"

Yes. Moments ago, he had already unleashed his signature technique, Ice Age, four times!

Normally, a single cast could freeze the sea for two weeks.

But now?

It was like pouring water into a bottomless pit. He kept casting it, desperately, but it kept failing.

"Admiral, sir! Do you want to rest for a bit?! Maybe drink some water?!"

"No! If I don't keep using Ice Age, Marineford is going to be swallowed by this storm!"

Boom!

With that shout, Aokiji leapt into the air once more, slamming down his most powerful Ice Age yet!

Cold, bone-chilling frost swept across the ocean, freezing it over again.

Through the ice, one could see countless sea creatures suspended mid-swim—locked in crystalline silence, forming a frozen layer in the sea's depth.

Deep beneath the sea...

Roman floated amidst the dark abyss, Ryūjin Jakka in hand, his aura surging with unmatched might.

The heat around him grew unbearable, even to the deep sea.

And then...

RUMBLE!

The ocean floor began to quake.

Ten underwater volcanoes, drawn by Ryūjin Jakka's power, awakened with a fury unseen in centuries!

Scarlet tongues of lava churned like a hellish army. Magma surged and frothed, bubbling forth like boiling blood.

Crack! Crack!

The seabed split apart, opening endless chasms—gaping maws of the earth splitting the ocean's belly wide open.

A catastrophe unlike any other.

Yet all that fire and fury was absorbed by Roman's blade.

Having absorbed the heat of ten volcanoes, the blade of Ryūjin Jakka boiled the sea itself!

Hovering above the destruction, Roman raised his Zanpakutō high—

"Burn."

He was ready to strike.

But just as he began his descent—

A terrified roar rang out!

"STOP!! STOP! I SURRENDER! I... I'll be your mount!!"

The mighty Sea Dragon… gave in.

Its voice trembled with fear.

It had no choice.

Roman's power had completely shattered its understanding of strength.

In its centuries of life, never—never—had it seen a human this terrifying.

Even Shirahoshi, the Mermaid Princess? It could ignore her.

But this man?

This monster who made volcanoes erupt just by drawing his sword?

It could only bow.

Honestly, how many humans could even fight it in the deep sea?!

Not to mention Ryūjin Jakka could produce such terrifying heat underwater and even awaken nearby volcanoes—how could the dragon not be afraid?

Having lived so long, the sea dragon knew exactly how devastating underwater volcanoes could be.

And now this monster in front of it could control fire! Hot enough to even boil the ocean!

'He summoned hell beneath the waves!'

It was helpless.

Roman smiled.

He hadn't expected the Sea Dragon to submit so quickly.

"Quite sensible, huh?" he muttered. "Let's spare it the pain, then."

He shifted his sword's trajectory, no longer aiming to strike the dragon.

Instead—

He swept Ryūjin Jakka in a wide arc through the sea.

A massive flaming slash cut through the deep—

—and erupted toward the surface!

BOOM!

The heavy ice above shattered instantly!

The ocean swelled—bulging outward—as if something massive beneath was forcing its way up.

In full view of the soldiers at Marineford, the bulge exploded!

BOOOOM!!!

Flames shot out from the ocean like a volcanic storm.

A deafening roar shook the skies.

Hurricane winds whipped up colossal waves, swallowing hundreds of warships.

Some ships were flung into the sky, spinning, before being devoured by the inferno.

Marineford, inside the highest office.

Sengoku stood before the enormous floor-to-ceiling window, eyes wide in shock.

"Those flames… It's... impossible! What is happening out there?!"

He clenched his fists.

"Contact Admiral White Dove immediately! I need to speak with him—NOW!"

"Yes, Fleet Admiral!"

Meanwhile...

Roman allowed Ryūjin Jakka to dissolve into his soul, vanishing from his hand.

After all, a Zanpakutō is born of the soul—its power can always return.

He landed calmly atop the Sea Dragon's head, gripping its horns, and used his ability to communicate with all things to say,

"Let's go, Little Sea. Back to Fish-Man Island."

"Yes, Master!"

"Oh yeah—'Little Sea' is your new name."

The Sea Dragon twitched.

With its massive body... was it really "little"?

But it didn't argue.

"Hey, Little Sea," Roman asked. "Why were you attacking Fish-Man Island in the first place?"

The Sea Dragon roared: "Because Noah's Ark, symbol of our sacred vow, was destroyed! I intended to destroy Fish-Man Island in retribution!"

"Oh, that?" Roman chuckled. "Relax. I've got another Noah's Ark. Looks exactly the same. Brand new too. No need to worry about it."

The Sea Dragon nodded.

As one of the greatest Sea Kings, it wasn't dumb—but it was loyal.

Sea Kings... value their oaths above all else.

Roman understood that well.

If he hadn't intervened, Fish-Man Island would likely be gone by now.

Back at Fish-Man Island—

Shirahoshi stood near the coral gate, hands clasped tightly, her heart filled with worry.

"Father... It's quiet now."

"Yes," King Neptune replied softly. "Even the burning feeling... is fading. Has the battle ended?"

"Roman will definitely win!" Shirahoshi said firmly.

She had never doubted it.

Just then, a massive black shadow loomed in the distance, slowly approaching the island.

Shirahoshi's eyes widened. Her pupils shrank.

Tears spilled from her eyes.

"No... No! That's impossible! Roman can't lose!!"

She shook her head wildly, unable to believe it.

The Sea Dragon was approaching.

King Neptune closed his eyes, despair filling his heart.

He could already imagine Fish-Man Island... destroyed under the sea dragon's assault..

Beside them, Shyarly sat in silence. Her face was pale, eyes full of hopelessness.

"I knew it…" she whispered. "No one can escape fate…"

Just as all three were plunged into despair—

A familiar figure appeared...

Standing atop the dragon's head, Roman…

He waved at them.

Shirahoshi, who had been closely scrutinizing the dragon, froze in place.

Speechless.

Tears were still falling.

But this time, they weren't from fear—they were from joy.