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One Piece: The Fourth Flame

King_kay27
14
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Synopsis
The day after Monkey D. Luffy sets sail from Foosha Village, another pirate begins his journey not for glory, treasure, or infamy, but for something far more precious: A family. Kael D. Raen, Luffy’s third-eldest sworn brother, is a hybrid of Oni and Buccaneer blood towering, fierce, and carrying the weight of generations on his shoulders. Hidden from the world by fate and fire, Kael finally steps into the Grand Stange not to conquer it, but to protect the ones who will. His goal is simple: carve out a place where his younger brother can dream freely, shield him from the world’s cruelties, and gather his own strange crew of lost souls along the way. But Kael’s lineage is anything but simple. Born of a mysterious union, he’s tied to the greatest names in the sea being a member of the D clan and having ties to his brothers Ace, Sabo, and Luffy. As rival powers clash and ancient truths surface, Kael will forge bonds, face monsters from both sea and soul, and build a harem of powerful, loyal women drawn to his strength and his heart. For Kael, this isn’t just an adventure it’s the rebirth of a legacy. And if the world dares to threaten his brother… They’ll learn exactly what it means to face the wrath of a Raen.
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Chapter 1 - Chapter 1: The Last Brother Left Behind

Dawn Island — Mt. Colubo

The wind danced through the trees, carrying the scent of saltwater and the distant, fading laughter of a boy on a stolen dinghy.

Monkey D. Luffy had finally set sail.

High above, perched on a thick, moss-wrapped branch, a lone figure watched the horizon. Kael D. Raen, lean, tall, and coiled like a predator ready to strike, leaned forward. His crimson-streaked black hair rippled in the breeze, twin obsidian horns hidden beneath a faded bandana. Tribal tattoos marked his powerful arms, a living map of Buccaneer blood and Oni resilience.

He wore the wide, reckless grin of Luffy. The fire-forged heart of Ace. The sharp, calculating eyes of Sabo. A storm made flesh, wrapped in a brother's quiet promise.

"Go get 'em, Lu," Kael murmured, gravel-deep and soft. "About damn time you went to chase your dream."

A frayed strip of red cloth tied around his wrist, a simple thing given by Luffy years ago, pulsed faintly with warmth.

Kael turned from the edge, dropping to the forest floor in a silent, fluid motion. The earth trembled slightly, not from his landing, but from something ancient stirring within him. Something old. Something long-forgotten was waking up.

[SYSTEM BOOTING…]

[Welcome, Kael D. Raen.]

[You are the Chosen Summoner of the Fourth Flame.]

[Condition Met: All three sworn brothers have departed on their paths.]

[Initializing System Core…]

Kael froze mid-step as a circle of shadow and flame ignited beneath his feet. Crimson symbols spun around him, unseen by the world, but sharp as daylight to him.

A translucent interface materialized before his eyes, its words carving themselves into his mind like a brand.

[System Functions Unlocked:]

• Summon System (5 Slots)

• Quest Log

• Ship Upgrade Tree

• Treasure Map Archive

• Inventory

[Summon Slots Available:]

• 1 Dead (Locked – No valid candidates)

• 1 Prime Era (Available)

• 3 Current Timeline (3 Available)

[Starter Quest Received:]

Ignite Your Path: Leave Dawn Island, summon your first ally, and seek your ship's first upgrade.

Reward: One Mythical Devil Fruit (Random)

Kael's pulse pounded in his ears. "What in the hell, and then it hit him.

The dreams. The fragmented memories of another world. One where Luffy's adventures were stories, printed in ink and bound in pages. He saw Ace's death at Marineford. Whitebeard's fall. He felt rage, grief, fury, and loss.

But this wasn't fiction anymore.

This was real, and he had a chance to change everything.

Kael clenched his fists, the air around him crackling like a storm's breath.

"No one's dying this time."

[Summon Option Available: Prime Era Character]

Select One:

– Gol D. Roger (Locked – Soul Unavailable)

– Edward Newgate (Whitebeard) (Locked – Still Alive)

– Shiki the Golden Lion (Available)

– Silvers Rayleigh (Prime) (Limited)

– Rocks D. Xebec (Dangerous – Suppressed Option)

Kael raised an eyebrow. "Rocks, huh? Yeah… no thanks."

He swiped the option away, focusing on what mattered.

[Current Summon Options Available (3):]

– Portgas D. Ace, Whitebeard Pirates, Second Division Commander

– Trafalgar D. Law, Surgeon of Death

– Yamato Oni Bloodline, Daughter of Kaido

His hand hovered over Ace's name.

A long, heavy pause.

"No… not yet," Kael whispered. "He's got his story. I need to write mine."

His gaze turned toward the base of the mountain, where a half-built ship rested within a cavern. His ship was a labor of solitude and fury, forged from scavenged wreckage, forest timber, and the sheer, brutal will of a Buccaneer's bloodline.

[Quest Updated: Depart Dawn Island]

[Summon Token (1) Available]

[Do you wish to use your first token?]

Kael's smile sharpened.

"Let's see what fate throws my way."

[Summoning Initiated: Searching Eligible Characters…]

[Selection Confirmed: Yamato Oni Bloodline, Current Timeline]

[Summoning…]

A thunderous shockwave of spiritual pressure burst through the forest. Leaves scattered, trees groaned, and the air itself trembled. A portal of crimson flame and swirling shadow tore itself open before him.

From its depths stepped a tall, fierce-eyed woman. Silver hair cascaded around curved horns, clad in furs and iron chains. An aura of rebellion, strength, and untamed fire blazed around her in waves.

Yamato blinked, her hand gripping the handle of her kanabō war club, Takeru. The weapon hummed with bloodlust. Her eyes narrowed and locked onto Kael, sharp and wary. "What the hell…? Where am I?"

Kael stepped forward, crimson eyes gleaming, beneath his bandana. A reckless grin curled his lips.

"I'm Kael D. Raen," he said, voice low and sure. "And I just summoned you."

Yamato tensed as her grip on her weapon tightened. "Summoned me? Who the hell are you to ?"

He raised a hand. "I'm not one of Kaido's dogs, and I'm not after your head. What I want… is a first mate."

She stiffened at that. Surprised.

Kael's grin widened, daring and wild.

"I need someone strong. Someone who won't be caged. Someone ready to tear the seas apart with me. So… what do you say, Yamato? You in?"

For a heartbeat, there was nothing but the crackle of residual energy in the air.

Then Yamato's lips quirked in a sharp, feral smile.

"Tch… you've got balls, I'll give you that." She hefted her kanabō over one shoulder. "Alright, Captain, I'm in."

[New Crew Member Acquired: Yamato – First Mate]

Kael chuckled darkly.

"Good," he said. "Let's go raise some hell."