"I hope I catch a big one today."
On the vast, endless ocean, on a lone, tiny boat, Yunan, clad in a black shirt, held a fishing rod in one hand, a blade of grass dangling from his mouth, lounging half-heartedly.
"Where did all the fish go today?"
"Don't tell me they're all staying home playing games and sleeping just because it's the weekend!"
After waiting for what felt like forever, the ocean remained as smooth as glass, not a ripple in sight.
Yunan let out a sigh.
"Splash!"
Suddenly, not far from him, ripples began to stir across the water.
The ripples grew into waves, and at the center, a violent whirlpool formed!
Yunan's small boat began to rock violently with the surging water.
"Hm?"
Yunan raised his eyelids lazily and glanced toward the disturbance.
…
"BOOM!!"
In the next instant, a towering wall of water surged skyward.
From the sea leapt a colossal beast, resembling a dragon-crocodile hybrid, tens of meters in size!
"ROAR!!"
The creature spotted Yunan and let out a thunderous roar, sending waves of shock that made the little boat shudder.
"Oh? A Sea King-class? Huh… looks kinda familiar."
Rather than fear, Yunan rested his chin on his hand, scrutinizing the beast with curiosity.
"…"
"I remember now! Isn't this the King of the Near Sea that bit off Red-Haired's arm?"
Suddenly, realization dawned on Yunan.
"Wow… so this is the very man-beast capable of taking down a Yonko's arm…"
Yunan laughed heartily.
"ROAR!!"
The King of the Near Sea, sensing Yunan showed no fear, reared its head back and let out an enraged roar, lunging with a massive bite!
"Hey, hey, get it straight—I'm not that Red-Haired guy who's all about self-sacrifice."
Yunan smirked, shifted his footing, and in the blink of an eye, vanished from the boat. He reappeared right before the King's massive skull, delivering a single, explosive punch.
"BAM!!"
With a crisp crack, the beast's enormous, sharp teeth shattered under Yunan's strike.
"ROOOAR!!"
The King howled in pain.
Its eyes turned blood-red as it let out a furious roar, charging once again at Yunan.
"Never learn, huh, beast?"
"Perfect… to test my newly unlocked skill."
Yunan stood, arms behind his back, calmly facing the charging King. Suddenly, his left eye darkened, and the scarlet six-pointed star of the Mangekyō Sharingan appeared!
"Amaterasu!"
With the words, a violent surge of chakra erupted from Yunan's body!
Moments later, black flames imbued with a sense of destruction engulfed the King's massive form.
"AAARRGH!!"
The creature screamed in agony, diving into the water to extinguish the flames.
But the black fire of Amaterasu clung like a bone-deep infection; the water could not put it out.
It thrashed and struggled, its ripping screams echoing across the ocean.
After several breaths, the King of the Near Sea was reduced to nothing before Yunan's eyes—no trace of bones or body remained.
"Ah, what a shame… I was looking forward to eating it. Now it's completely charred."
Yunan let out a sigh.
[Ding—Detection complete. Host Yunan has successfully killed one Sea King-class creature. Task completed.]
[Reward: Chakra Experience +100]
A system voice suddenly sounded in Yunan's mind.
"Time flies… I've already been in this world for eight years."
Yunan gazed at the Mangekyō Sharingan reflected in the water, its eerie red glow burning like a six-pointed star, and let out a long sigh.
Eight years ago, he had accidentally crossed into a remote island, bound to a ninja system, and gifted the terrifying power of the Mangekyō Sharingan.
But of course, the system didn't come with a manual.
On that isolated island, giant beasts and venomous insects roamed freely. To survive, Yunan had mastered the art of "scraping by."
Day by day, cautiously completing the system's tasks, he gradually learned various ninjutsu.
Recently, he had finally awakened the Mangekyō Sharingan ability: Amaterasu!
During these years, he had also figured out which world he was in—the world of One Piece.
"This system really likes to play," Yunan muttered.
"Sending me to the One Piece world but binding me to a Naruto ninja system… it's like grandma wearing layer upon layer of cotton pants."
He summoned his personal information panel in his mind:
[Host]Yunan
[Chakra]A rank
[Ninjutsu]A rank
[Taijutsu]B rank
[Genjutsu]A rank
[Eyes]Mangekyō Sharingan
[Element Mastery]Fire, Wind
"Taijutsu is still a bit weak… but at my current level, sailing should be fine."
"If I don't poke around in what Roger left behind, it'll all be for nothing."
Yunan smirked.
Just then, he noticed a small black dot rapidly approaching from the distance.
The dot grew larger and larger until Yunan finally recognized the approaching figure…
Fire Fist Ace?