At last: After Kai's relentless effort, day after day of brutal, hellish training, pushing his body to the limit and torturing both body and spirit…
Ten days later,
he finally pushed his Ghost Back Completion to 10%!
"Success!"
"My Ghost Back has finally reached 10%!"
"This time… just how much stronger will my training become?"
Kai clenched his fists, his face brimming with excitement.
After finishing another round of hellish training, his body was drenched with sweat, his clothes soaked through and clinging to him, leaving him with a chilling, sticky sensation.
Then—
the system's mechanical voice rang in his ears:
[Congratulations, Host. Ghost Back Completion has reached 10%!]
[Current Training Efficiency Multiplier: x100!]
"Wh–What?!"
A hundredfold boost?!
Kai's eyes widened.
His three-year-old body, lined with solid muscle, radiated a pressure that exceeded even boys far older than him.
"One hundred times!"
"That means… one day of my training equals a hundred days of someone else's!"
"Three days of my training is worth almost a year of theirs!"
At this moment, he was overjoyed.
Three days to achieve what others needed a year to accomplish…
What kind of concept was that?
In a single month, he could rival the gains of someone training for ten years!
Just thinking about it sent waves of excitement through him.
What about when his Ghost Back reached 20%?
Would the multiplier be two hundredfold?
Three hundredfold?
Or perhaps a thousand?!
By then…
one day of his training might equal a year for others!
Suppressing his excitement, Kai immediately began another round of training.
With this newfound hundredfold multiplier…
his spirit soared!
He threw himself into another thousand push-ups without hesitation.
"One!"
"Two!"
...
Sunlight spilled down, shining upon his small yet muscular body, witnessing his tireless effort.
An hour later, he finally stopped.
The system's voice echoed:
[This training yielded: Strength +0.01, Speed +0.01, Stamina +0.01]
[After 100x amplification…]
[Host gains: Strength +1, Speed +1, Stamina +1]
The next moment—
a warm current surged through his body, tempering his muscles, bones, and organs.
Kai snapped his eyes open, feeling the explosive power coursing through him. His fists clenched instinctively, overflowing with raw strength.
He had grown stronger—again!
"System, display my status panel."
Suppressing his excitement, he quickly pulled up his stats.
[Host: Kai]
[Strength: 6.7 (+1)]
[Speed: 6.1 (+1)]
[Stamina: 7.1 (+1)]
[Ghost Back Completion: 10%]
[Current Training Efficiency Multiplier: x100]
Just one day's training…
was equal to all the gains he had accumulated over the past ten days combined!
"Hahaha!"
Seeing the massive jump in his stats, Kai couldn't help but laugh aloud.
With a hundredfold boost…
What did he have to fear about becoming stronger?!
Even with the most basic exercises, his attributes would quickly stack up to monstrous levels.
And once he began learning Haki…
his power would skyrocket even further, advancing at a terrifying pace—growing by leaps and bounds day after day.
Kai was already eager to seek out his grandfather Garp and demand training in the Three Colors of Haki.
He was confident that—
by age four, he would master them.
By age five, reach Small Mastery.
By age six… achieve Great Mastery!
With a hundredfold multiplier, he had every confidence in making this a reality.
If it had only been tenfold, he wouldn't dare dream so boldly.
But now… things were different.
With this boost, a single day of his training was worth a hundred days for others!
What others needed years to achieve…
he could grasp in just half a month, or at most a single month.
That was the terrifying power of the Hundredfold Multiplier!
"Time to head back to the village."
Dragging his tired body, streaked with sweat and dirt, Kai rose from the grass. Even his back bore imprints from the weeds beneath him.
No matter how intense training was, he knew rest was essential. Otherwise, it would cause lasting damage to his young body—a risk he could not afford.
Now that he had the hundredfold boost, he could afford to ease up occasionally.
On his way back from the mountain,
He ran into his grandfather, Garp.
When Garp saw Kai's bare, muscle-toned torso, his expression softened into satisfaction.
"Training again in the mountains?"
Dressed in his usual black suit that stretched over his burly frame, Garp studied Kai carefully, his eyes flickering with a trace of astonishment.
He could feel it—
his grandson had grown stronger again.
And this time, the growth was even more dramatic.
"Not bad… not bad at all!"
"As expected of my grandson—born with unmatched talent!"
"Compared to Dragon's scrawny arms and legs, you, Kai, are the one who truly takes after me!"
"You're worthy of inheriting my will, to become the next great hero of the Marines!"
"The best thing Dragon ever did in his life was giving birth to you!"
It was clear that Garp was more than satisfied with his grandson.
"Grandpa, do you need me for something?"
After three years, Kai was fully comfortable in his new identity. Calling Garp "Grandpa" felt natural and easy.
"Oh, right. Almost forgot."
As they walked back toward Foosha Village, Garp casually said:
"You're about to have a younger brother. His name's Monkey D. Luffy."
"In another month, that good-for-nothing father of yours will be back with him."
"Every time he has a kid, he dumps them on me to raise. Damn brat… what kind of son does that make him?"
"I'm not getting any younger. I thought I could retire in peace, but every time your father shows up, he brings me a whole heap of trouble…"
Kai listened quietly, narrowing his eyes slightly.
Though Garp's words were full of complaints, Kai could hear the joy hidden between the lines.
A faint, knowing smile touched his lips.
"So, my foolish little brother… has been born already, huh?"
By the time they returned to the village, the sun was setting, casting long shadows across the ground.
Before parting, Garp added:
"Right, one more thing. Tomorrow, I'll introduce you to another kid your age. You'll be spending a lot of time there in the future."
"He's also my grandson, so you could consider him another younger brother."
"But how should I put it…"
"That brat's wild and troublesome. But with your strength, you should be able to straighten him out. Don't hold back—teach him a good lesson!"
"Especially… knock the thought of becoming a pirate out of his head. As my grandson, how could he dream of being a pirate? He must grow up to be a fine Marine!"
Hearing this, Kai's lips curled into a playful smile.
"Understood."
Another younger brother?
That could only mean…
Ace.
Got it.