(Note: Any differences from the original One Piece, timeline are caused by the butterfly effect of the protagonist's time travel. ♛‿♛)
Year 1476 of the Sea Calendar
West Blue – Ohara Island
The ocean breeze blew gently across the forested island, and seagulls soared through the blue sky with cheerful cries. Deep in the woods stood a small wooden cabin, and in front of it sat a young man in his twenties with messy black hair and simple clothes. His expression was full of frustration.
"Why did I have to time travel? And to the world of One Piece, of all places... so dangerous."
This man was once just a regular college student, who binge-watched the One Piece, anime he'd saved up for two years. Then, in true tragic fashion, he suddenly died... and woke up here, in the body of a man named Kavi.
As he sorted through Kavi's memories, he discovered that the original Kavi's life had been rough—his wife had run off with someone else, and in his despair, he retreated into the forest to live in isolation. Then, during a hunting trip, he got caught in a storm... and was struck by lightning.
That's when our Kavi took over.
"Hah... worse luck than me," Kavi muttered. "At least I died with a full anime queue. You got betrayed and zapped."
He shook his head, resolving to live a better life. "Fine. From now on, I'm Kavi."
He'd been in this world for three days, living off the food stored by the original owner. As a regular young man with no strength or special skills, Kavi knew better than to go wandering around in a world filled with pirates, sea kings, and warlords. So, for three days, he stayed inside the cabin.
"Seriously, who builds a house in the middle of the forest? I can't even go outside without worrying about getting mauled," he grumbled while chewing on dried meat.
Just as he was about to start planning his daily training, a mechanical sound echoed in his head:
[Ding!]
[The Supreme Sign-In and Stat-Boosting System has been successfully loaded!]
Kavi's eyes widened. "No way! So, the stories were true—time travelers really do get cheat systems!"
As an experienced webnovel reader, Kavi immediately understood this was his golden finger, his special power. He asked the system to explain.
[This is the supreme sign-in and stat-boosting system! Just sign in daily to receive stat increases. Occasionally, you'll receive bonus rewards. Live long enough, and you'll become invincible!]
"Then let's do it!" Kavi shouted. "System, sign in!"
[Sign-in successful. Constitution +1. First-time bonus: Critical reward triggered—You've obtained Conqueror's Haki (basic level)!]
"Conqueror's Haki?! Right off the bat? This system's amazing!"
Kavi felt the energy surge through him as he opened the panel in his mind.
[Character Panel]
Host: Kavi
Age: 25
Constitution: 11
Skills: Conqueror's Haki (Basic)
With just one sign-in, he had gained a real power—something that even most elite pirates couldn't easily obtain.
Kavi remembered One Piece well, at least up to the Wano Arc. He hadn't seen the later episodes due to schoolwork, and then... well, sudden death. But he'd seen enough TikToks and YouTube clips to know about Luffy's Nika fruit, the Four Emperors, and how insanely strong the top players were.
And that was why he decided not to do anything reckless. This was the Rocks Era. Legends like Garp, Roger, Whitebeard, and Golden Lion Shiki were all active. The infamous Rocks D. Xebec was still alive. It was a time when monsters ruled the seas.
"This isn't cowardice," Kavi told himself confidently. "This is strategic survival."
He had no interest in changing the world—he just wanted to live comfortably, train in peace, and become strong enough to explore the world on his own terms.
Also, as he reviewed Kavi's memories, he realized something else: he was currently on Ohara Island, the future hometown of Nico Robin—the place that would one day be destroyed by a Buster Call from the World Government.
Luckily, that event was decades away. For now, he could focus on getting stronger.
Eight Years Later
Kavi had lived in the forest for eight quiet, peaceful years. Every day, he trained and signed in to the system.
One morning, after his usual workout, he wiped the sweat from his brow and picked up the daily newspaper—a habit he'd developed over the years to keep up with world events.
Today's headline caught his eye:
"Garp Becomes the Navy's Hero!"
"Huh? So, the God Valley Incident just ended?"
Even without full details, Kavi could tell what happened: Vice Admiral Garp must've teamed up with Roger to defeat Rocks D. Xebec. That event marked the fall of the Rocks Pirates and the rise of the future Four Emperors—Whitebeard, Kaido, Big Mom... all former members of the same crew.
Kavi took a deep breath. "Yeah... this world is nuts."
He called up his current status.
[Character Panel]
Host: Kavi
Age: 33
Constitution: 3847
Skills:
Conqueror's Haki (Intermediate)Armament Haki (Intermediate)Observation Haki (Basic)Swordsmanship (Basic)
Devil Fruit: Human-Human Fruit – Pangu Form (Development 23%)
(A/N: The Pangu Form refers to a transformation or power state based on Pangu (盘古) — a mythological figure from Chinese creation myths. In stories, Pangu is the primordial being or god who created the world by separating heaven and earth from the chaotic void.)
Eight years of daily sign-ins and consistent training had finally paid off. The system had boosted his stats by over 2,000 points. His own physical training had added more than 1,000. Though the effects of exercise had diminished in recent years, his growth was undeniable.
As for his Devil Fruit—it was a rare, custom-made fruit provided by the system. It was formed using a diluted drop of Pangu's blood and translated into the One Piece, universe's power system. According to the system, it had no side effects.
Kavi still hadn't unlocked any special abilities from the fruit yet, but it had drastically increased his defense and strength.
"Well, if exercise isn't giving me much now, maybe it's time to lie down and let the system carry me for a while."
He smiled, satisfied with his steady path to power. He wasn't in a hurry to become famous. The world could stay crazy outside. For now, Kavi would keep training... until he was strong enough to stand at the top.
Hello there! I'm the author, excited to share that this is my fourth fanfic.
Well... technically, I didn't write it—I just translated this awesome Chinese fanfic!
Haha, hope you don't mind that little detail.
Either way, enjoy the story—and thanks for reading!