In the underground laboratory of Capsule Corporation, the air was thick with the distinct scent of engine oil mixed with ozone.
A massive hemispherical Gravity Room stood in the center like a sleeping steel beast.
The heavy alloy hatch was wide open, revealing the empty, cold training space inside.
"Even though it's a prototype, the core stabilizer is quite decent," Dr. Brief said, holding his pipe in one hand while tapping on the complex control panel with the other.
"Theoretically, it can go up to three hundred times gravity, but the foundation of this villa would probably collapse by then."
He turned and looked at the eager, bald youth beside him, a strange glint behind his glasses.
"Krillin, are you sure you don't want to wear a protective suit? Even astronauts wear pressure suits to protect their internal organs."
"No need."
Krillin stood shirtless in loose training pants. Under the cold white lights, his skin carried a healthy bronze hue, lean muscle lines hiding surprising explosive strength.
"Only by letting the body directly feel the crush of gravity will the cells remember this fear and then evolve."
He stepped into the hatch.
The heavy hydraulic door slowly closed behind him with an ear-grating locking sound.
The world fell silent, leaving only the faint hum of the ventilation system.
"Let's try two times first," Dr. Brief's voice came through the speaker.
"Ten times straight away," Krillin said, gesturing toward the camera.
Dr. Brief's hand trembled at the console, and the black cat on his shoulder let out a sharp cry.
The Doctor sighed and pushed down the red lever.
A deep hum filled the Gravity Room as red warning lights flickered on. Low-frequency vibrations instantly flooded the space.
This wasn't like carrying a heavy load.
Gravity was omnidirectional.
At that moment, Krillin felt as if the blood in his body had turned into mercury. What once flowed lightly now felt unbearably heavy.
Every heartbeat required ten times the usual effort to pump that weight through his limbs and organs.
"Cough!"
Krillin let out a muffled groan as his knees buckled, nearly slamming him to the floor.
His vision blurred as his eyeballs were dragged downward. Every breath felt razor-sharp, his diaphragm contracting violently against the invisible pressure.
This was ten times gravity.
It wasn't like stacking ten Krillins on top of him. It was pressure on every inch of skin, every blood vessel, every organ.
An ordinary human would have already suffered ruptured organs and massive internal bleeding.
But Krillin did not fall.
"Saitama template... adaptability activated," he muttered inwardly.
The power of that bald Great Devil King had not been innate. It had been forged through breaking limiters day after day.
This crushing sensation at the edge of his limits was the best fuel for shattering them.
Krillin gritted his teeth, veins bulging along his neck like twisted cords.
Slowly, inch by inch, he straightened his back.
His bones creaked like an old wooden ship caught in a storm.
"Inhale... exhale..."
He forced his breathing into rhythm, dragging that heavy oxygen deep into his lungs.
"First item... push-ups... one hundred."
He dropped into a prone position.
Even that simple movement felt like lifting a mountain under tenfold gravity.
His palms pressed into the high-strength alloy floor, leaving slight dents beneath his hands.
"One."
Down. Then up.
The moment sweat seeped from his pores, gravity dragged it straight down, splattering against the floor.
"Two."
His triceps screamed as muscle fibers tore and reorganized at a microscopic level, becoming denser and tougher.
This was exactly what he wanted.
Delivering milk and plowing fields at Kame House had been decent training, but with the Saitama Physique already integrated, the efficiency was too low.
He needed this kind of brutal, unreasonable devastation.
Outside the control room, Bulma stood before the one-way blast-proof glass, holding a tray with a towel and a specially formulated electrolyte drink.
She had seen Yamcha train before.
When Yamcha trained, he shouted loudly, used flashy moves, and struck poses after every punch as if a camera were filming him.
Krillin was different.
Inside the Gravity Room, the bald youth moved without excess.
He simply lay on the ground, mechanically repeating push-ups in silence.
Sweat pooled beneath him, steam rising from his bare back. Under increased gravity, the steam didn't drift upward but slid eerily along the floor.
It wasn't pretty. It was almost savage.
Yet Bulma couldn't look away.
The muscles on Krillin's back flexed like a fully drawn bow. Every fiber trembled, yet moved in perfect rhythm.
There was no performance in it.
Only a pure, relentless desire to grow stronger.
"Ninety-eight..."
"Ninety-nine..."
"One hundred!"
He completed the final repetition and immediately flipped over into sit-ups without resting.
His abdominal muscles were sharply defined, like carved stone.
Bulma felt her cheeks heat up.
As the daughter of the world's richest man, she had seen all kinds of exceptional men—refined gentlemen and powerful martial artists alike.
None of them had ever given her this feeling.
This raw vitality that struck her even through thick reinforced glass.
Ten minutes later, the gravity shut off.
The red warning lights faded, replaced by green.
The pneumatic system hissed as the hatch slowly slid open.
Krillin pushed himself up from the floor, soaked as if he had just been pulled from the sea.
With ten times gravity gone, his body felt almost weightless.
Sweat streamed down his smooth head, across his chest, and disappeared beneath his waistband.
Bulma's eyes followed that droplet before she abruptly snapped back to reality and looked away.
"Here."
She handed him a soft white towel.
Krillin looked up and caught her evasive gaze. "Thanks."
He wiped his face casually.
"This is a special sports drink to replenish electrolytes," she said, pushing the cup into his hand.
Their fingertips brushed. She recoiled instantly, as if shocked.
"This Gravity Room is pretty good," Krillin said after downing the drink in one gulp.
His Adam's apple bobbed as he exhaled in satisfaction. "The floor's a bit soft, though. Tell the Doctor to use harder materials next time."
"That's aerospace-grade titanium alloy!" Bulma shot back. "You're just too much of a freak!"
Steam still rose faintly from his body. She meant to tell him to go shower, but the words shifted as they reached her lips.
"Um... did your muscles get bigger than yesterday?"
Krillin glanced down at his chest and squeezed casually. "Probably just pumped. Why, you don't like this?"
He stepped closer until less than half a meter separated them.
A strong scent of sweat and hormones filled the air—not unpleasant, but raw and aggressive.
Bulma's heart skipped as her back pressed against the cold control panel.
"Who said I liked it..." she muttered, turning her head away, ears burning red. "It's all hard and looks uncomfortable."
"Is that so?" Krillin smiled and stopped there.
"I'm going to take a shower. By the way, what's for dinner? This kind of training burns too many calories. I feel like I could eat a whole dinosaur."
As he walked away, his broad back formed a perfect inverted triangle under the lights.
Bulma took a deep breath and slapped her burning cheeks.
"Bulma, get a grip! He's just a baldy! And he's just a teenager!"
Yet despite her words, the image of that bead of sweat sliding across his chest refused to leave her mind.
...
Author's Update 18+ 📢
The fanfic Naruto: Raised by Kushina, Took His Brother's Wife – Part 1 is now officially fully completed!
It is now available on Patreon for all tiers, including the lowest Tier 1.
The complete Part 1 has been uploaded on Patreon.
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