During the morning theory class, Sunada Shun lectured on the foundational applications of chakra control, focusing specifically on condensing chakra into localized areas of the body to enhance physical defense. The concepts were basic, but Sengoku listened in absolute silence, his mind already dissecting the theory and translating it into combat applications.
By the afternoon practical class, the sparring sessions resumed as usual.
Araki Ryo stood across from him once again, seemingly fixated on settling their previous score. He dropped into his stance, his eyes sharper and more serious than usual.
The moment Sunada signaled the start, Araki charged. He lunged forward with a driving straight punch aimed directly at Sengoku's face, his speed and kinetic output noticeably higher than the day before.
Sengoku calmly shifted his weight and raised his forearm to block. The impact vibrated clearly through his bones, but his newly enhanced strength absorbed it without yielding. As he stepped back to absorb the remaining force, he decided to test the movement mechanics he had been theorizing. Pushing a micro-pulse of chakra into the sole of his foot, he executed a sudden side-slip.
His speed spiked for a fraction of a second—just enough to make Araki's follow-up kick hit empty air.
Araki grunted in surprise, his momentum faltering for a heartbeat. Recovering quickly, he pressed the attack with a fierce barrage of punches and kicks, seamlessly weaving in a few throwing stars from tricky angles.
Sengoku's eyes tracked every movement. He drew a training kunai, effortlessly deflecting the shuriken with sharp metallic clangs while weaving through the physical strikes. Waiting for the inevitable overextension, he found his opening. Channeling force from his legs up through his waist, he stepped inside Araki's guard and drove a simple, brutal elbow strike directly into the boy's ribs.
The spar ended as quickly as it had begun. Araki backed away, panting heavily as he let his arms drop.
"Sengoku wins," Sunada announced, recording the result on his clipboard without a flicker of emotion.
While Araki caught his breath, Sengoku glanced toward the other sparring rings. One pair of students had devolved into a clumsy, rolling brawl in the dirt, blindly swinging blunt kunai at each other. Another pair was slightly better at maintaining distance, but their shuriken throws were wildly inaccurate, leading them to quickly abandon their weapons in favor of uncoordinated haymakers.
Sengoku looked away, taking a sip from his canteen. To his enhanced perception, their frantic brawling was nothing but a chaotic mess of wasted energy and massive tactical openings.
When the academy bell rang, the training grounds quickly emptied out. Sengoku immediately headed for his usual secluded corner.
He stood still, focusing his mind. He compressed chakra at the soles of his feet and let it erupt.
His body launched forward, crossing three meters in a blur before his feet planted firmly into the dirt. The straight-line sprint was completely stable now. The real challenge lay in the next step.
He reset his stance and launched forward again. This time, midway through the dash, he attempted to funnel a surge of chakra entirely into his left foot, stomping down hard to force a sudden change in direction.
The conflicting forces violently shattered his balance. His center of gravity twisted awkwardly, and he slammed shoulder-first into the coarse sand.
His expression remained completely flat. He picked himself up, dusted off his clothes, and reset his stance.
He dashed. He tried to pivot. He fell.
He got up and did it again.
The secluded corner echoed with the heavy thud of rapid footsteps followed by the dull scraping of a body hitting the dirt. With every bruising failure, Sengoku's mind processed the physical feedback, refining his understanding of weight distribution, the exact timing of the burst, and the precise volume of chakra required.
It wasn't until the sun dipped low against the horizon that he finally managed a breakthrough. Covered in grime and running low on chakra, he forced a desperate, single-foot pulse mid-sprint. His body tilted precariously, but he successfully carved out a sharp, near-ninety-degree turn.
It was incredibly clunky, bleeding almost all of his forward momentum, but he had undeniably changed direction.
Standing in the center of the cratered, uneven sand, Sengoku caught his breath. The kinetic memory of that barely successful turn was burned into his mind. It was far too rigid. The speed loss was unacceptable, and the coordination between the chakra burst and his center of gravity was still painfully raw. But it proved the concept was viable.
He just needed finer control.
Instead of immediately trying another high-speed dash, Sengoku stripped the technique down to its absolute foundation. Standing perfectly still, he condensed chakra solely in his left foot and triggered a tiny, localized pulse. His body swayed slightly from the force. He repeated the process with his right foot, carefully analyzing how the unilateral thrust affected his resting balance.
Next, he began a series of continuous, single-foot hops. With every jump, he fired a microscopic pulse of chakra from his sole, forcing his muscles to adapt to stabilizing the sudden, artificial lift. He looked ridiculous—like a clumsy bird awkwardly bouncing across the sand—but he ignored the aesthetics entirely.
Sweat dripped off his chin, darkening the soil beneath him. When his stamina finally redlined, he sat in the dirt to recover, only to stand up and resume the drill minutes later. Through the sheer, mind-numbing repetition, a faint sense of control began to take root in his muscle memory.
He didn't stop until the sky turned pitch black and the dim perimeter lights of the training ground flickered on. Only then did he pack his gear and begin the quiet walk back to his stone house.
Over the following days, a grueling, immovable routine settled into place. Morning theory classes, afternoon sparring, and then hours of solitary after-school training. He would practice his chakra threads and shuriken jutsu until his arms burned, dedicating every remaining drop of energy to mastering the pulse movement.
In the afternoon practicals, his spars with Araki evolved from simple combat into active field tests. Sengoku began deliberately using the aggressive boy as a moving target to trial his unrefined directional changes.
During one particularly intense exchange, Araki stepped into a heavy, looping haymaker. Instead of retreating or blocking, Sengoku attempted a point-blank pulse pivot, aiming to vanish from Araki's line of sight and appear at his flank.
But he miscalculated. He pushed slightly too much chakra into the pivot foot, causing his leg muscles to lock up from the sudden strain. His movement violently stuttered.
Araki, initially startled by the sudden blur of speed, reacted purely on instinct. Seeing Sengoku freeze in the pocket, Araki aborted the missed punch, seamlessly twisting his hips to drive his elbow into the opening.
The strike slammed heavily against Sengoku's hastily raised guard. The kinetic force shoved Sengoku back two full steps before he could dig his heels in.
"Ha!" Araki grinned, looking thoroughly pleased with himself. "That weird footwork of yours isn't so great after all!" It was painfully obvious the boy hadn't paid a shred of attention to Sunada's lecture on Shunshin principles.
Sengoku simply shook out his numb arm, silently logging the exact cause of the failure: Over-output of chakra during the directional shift resulting in muscular rigidity.
From the sidelines, Sunada's eyes swept over them, his pen scratching quietly against his clipboard.
The rest of the training ground remained a circus. Two students were forced to run laps after getting into a genuine fistfight over practice equipment. Another group's stray shuriken sailed over the divider into a neighboring ring, sparking a chorus of complaints and mocking laughter. The atmosphere was loud, inefficient, and entirely unfocused.
Sengoku tuned it all out, his mind already planning his evening drills.
His after-school sessions grew even more punishing. He abandoned long-distance sprints entirely, drawing jagged, zigzagging lines in the sand. His sole objective was to navigate the erratic paths using only pulse movements, forcing rapid acceleration, sudden stops, and sharp turns.
Failure remained his constant companion. He tripped, crashed, and ruined his own lines time and time again. Yet, with every crash, the intricate dance between chakra output, timing, and center of gravity became a fraction more natural.
He didn't let his other skills rust, either. After completing dozens of standard kunai throws, he began attempting to maintain a chakra thread while actively using the pulse movement. Connecting a thread to a kunai in mid-air while violently shifting his own position caused the difficulty to skyrocket. The failure rate was astronomical, but he executed the drills with mechanical precision.
Late at night, under the flickering light of his oil lamp, the Chakra Thread Manipulation scroll became his bible. The dense text detailing micro-control and instantaneous force application, which had once seemed purely theoretical, now leaped off the page. Anchored by his daily physical failures, the complex puppetry theories finally began to make perfect sense.
Trapped in this cycle of relentless, quiet suffering, the days rapidly slipped by.