Seeing Kai step into the capsule, Zephyr's eyes lit up with anticipation.
Electrotherapy stimulation training…
This was the first time he'd ever witnessed such an extreme method.
In the past, he'd never even had the chance to see it—
Because no one would ever request something like this.
Only Kai was different.
That kid was too much of a monster.
So much so that the Marine top brass had been forced to create an extreme training plan just for him.
Otherwise, there simply wasn't any other method that could reliably push Kai's strength upward.
"Admiral Zephyr… can we begin?"
The research team leader standing beside him asked cautiously.
He didn't dare act on his own.
Everything had to follow Zephyr's command.
Because if anything went wrong…
He'd be finished.
He knew exactly what kind of background the four-year-old inside that capsule had.
That was the Marine Hero Garp's grandson—
And Fleet Admiral Kong's publicly acknowledged future banner-bearer of the Marines.
If anything happened to someone like that…
He wouldn't be able to carry the consequences.
"Begin," Zephyr said, nodding.
His eyes held both excitement and tension as he stared through the transparent barrier at Kai inside the capsule.
"Yes, Admiral Zephyr."
The team leader nodded and moved quickly to the control room.
Through the control room's transparent liquid-crystal glass, he could clearly observe every detail inside the capsule.
That way, if an accident occurred, he could terminate the session immediately.
"Start the capsule electrotherapy stimulation protocol!"
The team leader took a deep breath and issued the order to his subordinates.
"Yes!"
Less than ten researchers in white lab coats moved at once, following the team leader's commands as they toggled the switches connected to the capsule.
In an instant—
All circuits were connected.
"Set the electrotherapy intensity to Level One for now," the team leader ordered.
The capsule's electrotherapy system had five intensity levels.
Level One was the weakest.
Generally speaking, Level One wouldn't cause any negative effects on an ordinary person—
It might not even produce pain at all.
Level Two doubled the intensity.
And Level Two was already beyond what normal adults could endure; only those with strong physiques—true "talents"—could bear it.
Then came Level Three.
Then Level Four…
And Level Five.
Level Five was the maximum intensity.
Its power could turn an ordinary adult into ash in an instant.
That alone showed how terrifying Level Five was.
Even among "monsters," few were qualified to touch Level Five.
And even for those who could, they couldn't endure it for long.
For now, Kai's treatment began at Level One—
So the stimulation wouldn't be too intense right away.
The researchers dared not set it too high.
They were terrified that something might happen.
Every face was tense as they watched the capsule.
At the same time, as the current surged inward—
Kai inside the capsule felt it immediately.
Electric currents wrapped around his body in countless strands.
His skin tingled as though ants were crawling over it—slightly numb and sour.
"So this is electrotherapy stimulation training?"
Kai narrowed his eyes, excitement and curiosity flashing across his face as he felt the current winding all around him.
Inside the capsule—
Electricity was everywhere.
Even the air he breathed carried faint currents.
Zzz—zzz—zzz!
The currents stimulated Kai's body relentlessly, coiling around him, provoking his cells—
Even his internal organs were being "worked."
With every breath, tiny currents slipped down his throat and into his body.
Countless sparks danced within him like living lightning.
"This sensation…"
Kai closed his eyes slightly and carefully felt the changes.
Under the stimulation, he could very clearly sense—
"My strength… is increasing fast!"
Kai's eyes snapped open, a sharp light flashing inside them.
The feeling of getting stronger was immediate and direct.
Power inside him surged upward in waves—
Growing stronger.
More terrifying.
Like a volcano suppressed for too long, ready to erupt and shatter the world.
"But…"
"It's still not enough."
After a moment, Kai raised his brows.
At this level, the current was basically a tickle.
His physique was too strong.
If he wanted to stimulate his cells more effectively, the intensity had to rise.
This wasn't nearly enough.
"Instructor Zephyr—tell them to raise the intensity."
"This isn't enough yet!"
Kai spoke through the glass toward Zephyr outside.
He didn't know if Zephyr could hear him—
But Zephyr clearly understood anyway.
Turning his head, Zephyr spoke to the team leader in the control room.
"Adjust the current again."
"Raise it straight to Level Three."
The moment the order came—
The researchers in the control room turned pale.
"Raise it that high in one go?"
"Captain… are you sure nothing will go wrong?"
A few researchers hesitated, eyes full of worry.
"Relax," the team leader gritted his teeth. "If Admiral Zephyr dares to give the order, he has his reasons."
Then he barked at his subordinates:
"Do as Admiral Zephyr said—raise intensity to Level Three!"
Level Three was already extremely fierce stimulation.
If an ordinary adult endured it recklessly, they'd likely be shocked unconscious and suffocate in under three seconds.
"Yes, Captain!"
The researchers hurried to comply.
Soon—
Inside the capsule, Kai felt the current intensify in rising waves.
What had been a tickle now brought a scorching sensation, like sharp claws tearing at his muscle fibers—
Tempering even his internal organs—
Stirring his viscera again and again.
And yet—
Kai didn't look pained.
Instead, his expression turned almost… intoxicated.
"My growth speed is clearly faster than before."
"This so-called electrotherapy stimulation training…"
"It really works!"
Kai smiled widely, thrilled.
He closed his eyes again, savoring the powerful currents saturating the air—
Savoring the feeling of electricity provoking every cell in his body—
And right as Kai was immersed in the pleasure of rapid growth…
Without warning—
The system prompt sounded inside his mind.
[This training session yielded: Strength +0.007, Speed +0.009, Stamina +0.009, Mental Power +0.08!]
[After the 100x training effect boost…]
[Host gains: Strength +0.7, Speed +0.9, Stamina +0.9, Mental Power +0.8!]
Before Kai could even react—
BOOM—
A roar echoed inside his body.
A warm current appeared out of nowhere and surged through him, washing over his organs, tempering his meridians, bones, and blood.
Warmth spread slowly—
Giving Kai a blissful sensation of becoming far stronger.
He was completely intoxicated.
After a while, the system's "refinement" ended.
Kai opened his eyes.
He clenched his fists—
Feeling the surging, terrifying power packed within them.
For a moment, he looked dazed, murmuring to himself.
"I got stronger."
He truly hadn't expected this.
Electrotherapy stimulation training…
Could actually combine with the Ghost Back System's 100x amplification.
That was beyond his expectations.
This surprise hit him like a storm.
"Electrotherapy training is already insanely effective…"
"And now it gets an additional 100x boost."
"I have a feeling…"
"My strength is about to enter a period of explosive acceleration."
"Surge after surge!"
Kai's eyes burned with excitement.
He had to admit—
Today's electrotherapy session gave him a completely different experience.
And more importantly—
It showed him a clear path to skyrocketing strength.
For a while now, even with daily devil training, Kai's gains had been tiny.
But now, after only one electrotherapy session—
His strength had surged by a noticeable margin.
Of course he was thrilled.
"A jump this big…"
"It's been so long."
"I haven't felt a one-time surge this massive in ages."
Kai's heart shook with amazement.
He was extremely satisfied with this electrotherapy method.
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