Crack... crackle...
The sound of splintering wood and the roar of a burgeoning inferno filled the air.
"Woo woo woo...!" The wails of the Straw Hat crew echoed across the shore, muffled by the thick, choking mist.
"Ren, bye—!"
"Take care! We'll wait for you on the next island!!"
"You must come back alive, you hear me?!"
"I'm sorry... I wrongly blamed you before... I'm so sorry!"
On the coast of an unnamed desert island, the atmosphere was a chaotic symphony of grief and destruction. Shocking heat waves pulsed from the center of the beach, turning the sky a bruised, violent crimson. The earth beneath was scorched to a blackened husk, and the sea surface—usually a cool azure—was now an unbearable cauldron of bubbling brine. Thick, white steam rose in pillars, veiling the horizon in an impenetrable fog.
The Straw Hats stood frozen for a moment, the realization sinking in: staying here would not help. They would only be a liability to Ren, who had remained behind to "break off" from the crew and face the ultimate threat alone.
With hearts heavy and eyes streaming with tears, they finally made their choice. They couldn't let Ren's sacrifice be in vain. Ruthless to their own desires to stay and fight, they turned toward the Going Merry. They were unwilling to lose him, yet they knew they had to flee while he bought them a window of escape against the highest combat power of the Navy Headquarters.
"I'm really speechless... why is everyone so moved?"
Listening to the crew's sincere, sobbing "confessions" echoing from the distance, Ren—bathed in swirling tongues of fire—felt a metaphorical drop of sweat slide down the back of his head.
Despite their emotional outburst, there was no flicker of hesitation in his heart. He had no intention of returning to the Straw Hats. From the moment he arrived in this world, he was unwilling to be ordinary. He had chosen to follow his own heart and carve his own path, even if that path diverged from the future Pirate King.
"Robin... we'll meet again soon."
Ren watched the Golden Merry slowly shrink into a speck on the horizon. He thought of the woman who acted like a gentle, intimate big sister—the one who would pretend to read casually on deck but was always silently watching over him.
He remembered the rhythm of their days. Whenever he finished a grueling session of practice, she was there. One pair of "hands" would sprout to bring him tea, another to offer a towel, and sometimes, a pair would even gently wipe the sweat from his brow.
Recalling those quiet moments, Ren couldn't help but chuckle softly.
"Sorry, Luffy," he whispered to the wind. "Right now, you don't even have the strength to protect her. Instead of letting Robin follow you into a death trap, it's better she follows me."
From the start, Ren had been preparing to pull Robin into his own camp. But he knew the timing wasn't right. Robin's heart was still locked behind a cage of trauma; she hadn't experienced that final, transformative despair yet.
He knew what was coming: Water 7. The threat of CP9. The betrayal of the world. That would be the moment he would act. He would show her that the "Buster Call"—the demon-slaying shadow that haunted her dreams—was nothing more than a flickering candle in the face of a truly strong person.
"Ararara... such a touching display of friendship."
A cool, lazy voice cut through the heat. Out of the wall of flames and thick smoke stepped Aokiji. The Naval Admiral looked entirely unharmed, his tall frame relaxed despite the hellscape surrounding them.
He watched the Merry disappear, then turned his gaze toward Ren—the man known as 'Sparks' Ren, or more infamously, 'Blood Prison' Ren.
"But I can't let a dangerous guy like you roam free anymore," Aokiji said calmly, his breath hitching into a visible frost. "It's a pity, but your journey ends here."
"Yeah?"
Ren didn't flinch. He gripped the hilt of his blade, Hongxue Zuomonji, and leveled the point directly at the Admiral's heart. Ren's eyes were blazing, reflecting a fighting spirit that bordered on madness.
"I was going to say the same thing," Ren smiled, his teeth flashing white against the soot. "If the title of 'Admiral' is just for show, then please... stay here forever."
"I'm really being underestimated today," Aokiji sighed, shrugging his shoulders.
In an instant, the moisture in the air hissed. An ice blade condensed in Aokiji's hand, jagged and translucent, but quickly turning a deep, matte black as it was coated in high-grade Busoshoku Haki. Even amidst the rolling heat waves, the blade showed no sign of melting. Instead, it radiated a bone-deep chill.
"No matter what," Aokiji's voice dropped an octave, "I am still an Admiral of the Navy."
Soru!
Aokiji's feet slammed into the scorched earth, and he vanished. He reappeared in front of Ren like a bolt of blue lightning, swinging the ink-black ice blade in a lethal arc.
Keng!
Using his own advanced Kenbunshoku Haki to predict the trajectory, Ren met the blow. His own blade was already wrapped in hardening Haki, sparks flying as the two powers collided.
Clang! Clang! Clang!
Between the electric flashes and the flying flint, the two engaged in a fierce exchange of swordsmanship. Hongxue Zuomonji began to glow, its steel burning with an astonishing high temperature that rivaled a furnace.
Ren was no longer suppressing his power. The color of the flames gushing from his body deepened from orange to a violent, searing crimson. The flowers, grass, and trees had long since vanished. Now, the very ground was melting into puddles of bubbling magma.
"Huh... huh..."
But the temperature fluctuated wildly. Every time Ren pushed his heat forward, a wave of intense cold pushed back. The red-hot rocks were instantly encased in frost, cracking under the thermal shock.
The coast was now a battlefield of two colors: one side a frozen wasteland of pale blue frost, the other a churning hell of red magma. They squeezed against each other, neither yielding an inch.
Boom!
The alternating temperatures created a vacuum, triggering fierce wind pressures that howled like dying beasts. Even the sea nearby began to boil and freeze simultaneously, creating a surreal, misty graveyard.
Far out at sea, the Straw Hats watched through monoculars, their faces pale. They couldn't see the individual strikes anymore—only the catastrophic environmental shifts that signaled the intensity of the fight.
"Gulu..." Usopp swallowed hard, his knees shaking. "Is that... is that Ren's true strength?"
"Hiss—" Sanji exhaled, his cigarette forgotten. "The Admiral... he's a monster."
Zoro's hand gripped the hilt of Wado Ichimonji so hard his knuckles turned white. When Aokiji had fought them earlier, it had been like an adult playing with children. Now, they realized the Admiral hadn't even been trying. And Ren was matching him.
Nami and Robin clung to the guardrail, their knuckles white. The sheer scale of the power on display was suffocating.
"Aokiji..." Robin whispered, her body trembling with a cold that had nothing to do with the weather.
Suddenly, a door slammed open.
"Luffy, wait!" Chopper's voice shrieked from the cabin.
Luffy, still shivering and covered in bits of melting ice, stumbled onto the deck. He had just regained consciousness after being frozen solid by Aokiji earlier. He didn't wait for a check-up; he ran straight for the railing.
"Ren?"
Luffy stopped dead. He looked at the vast sea and the distant island. He saw the horizon split in two—one side a towering pillar of ice, the other a volcanic eruption of flame. The two heavens were colliding in a roar that reached even their ears.
He was stunned. The gap between where he was and where those two were fighting was a chasm he couldn't yet cross.
"That is..." Luffy's voice trailed off as he watched the man who had been his crewmate challenge the world's greatest power.
Back on the island, Ren's breathing was heavy, but his smile had grown wider.
"You're amazing, Aokiji," Ren panted, the air around him shimmering with heat distortion. "But I told you... I'm not going back to a cage."
Aokiji wiped a bead of sweat—or perhaps a drop of melted frost—from his brow. "You're a problem, Ren. A big one."
The two moved again, a blur of fire and ice, as the unnamed island began to tear itself apart under the weight of their battle. This wasn't just a fight for an escape; it was the birth of a legend that would soon make the entire world tremble.