My Perfect Isekai: Pragmatic Protagonist, Progression Fantasy and Strategy

The raw basalt beneath my right foot fractured with a dry, metallic snap. There was no room to catch a breath, nor any time to analyze the stiffness in my motor conduits left behind by yesterday’s voltage experiment. Before the faint stench of singed flesh could even disperse into the morning air, a supple bamboo staff emerged soundlessly from the ravine’s thick, grey fog.

It sliced through the air in a tight horizontal arc, aimed squarely at my collarbone plexus. The motion was stripped of any magic—pure, visceral, and lethally fast.

I didn’t step back. Moving backward meant surrendering balance and yielding initiative. Instead, I dropped my center of gravity by barely an inch, flowing into a seamless hip rotation. The Lynx Footwork operated flawlessly on the level of raw skeletal mechanics. I let the whistling tip of the bamboo graze past my neck by a hair’s breadth, then snapped my left forearm up, parrying the dense wood outward.

In that exact fraction of a second, my unlocked conduits sparked.

Instinct flared up, trying to force dense sapphire plasma through my channels to blast the old man away with a kinetic discharge. Blue electricity ruptured beneath my skin, tearing outward in jagged, wild arcs. A sharp, stinging stench of ozone cut through the air, and the nearby stone ledge hissed under the sudden spike in voltage.

”Stupid habit!” the Master growled without blinking.

His clouded, milky Tiger’s Eye gaze didn’t require light to register the flash. Rather than wrestling against the parried staff, the old man simply relaxed his grip, letting the wood glide past my arm, and drove the blunt butt of the weapon directly into my right floating ribs.

The heavy, hollow thud rattled my entire ribcage. Pain, sharp and immediate, drove into the muscle like a battering ram. My bare feet lost traction, skidding three yards back across the volcanic gravel.

”You still think like an arsonist, kid,” the old man said coldly, resting the bamboo across his shoulder. Not a single spark flickered around his ragged robes, yet the sheer, dense weight of his dormant KAI parted the mist around him in a perfect circle. ”You vent your current loose into the open. You shatter space, make noise like a carnival hawker, and then wonder why your reserves drain dry. What does tearing an enemy into bloody ribbons get you in an alleyway in Crossgard? You think the city guard and guild patrols will walk past steaming entrails without blinking? Blood draws dogs. Corpses breed investigations. If you want to operate in the shadows, learn to cut the lights without leveling the walls.”

I wiped the corner of my mouth with the back of my hand, tasting copper. Slowly, that familiar, predatory smirk crept back onto my face. The pain in my ribs wasn’t an obstacle—it was raw, unvarnished feedback. It pinpointed the exact millisecond where my body had tensed unnecessarily.

”Pure logic, Master,” I muttered, shaking out my shoulders and letting blood circulate freely through the bruised tissue. ”Lightning is an expanding force. If it has nowhere to go, it tears apart whatever it hits. To keep the walls standing, I need to seal it inside something.”

”Then seal it,” the old man cut in bluntly, bringing the bamboo upright. ”Or you’ll be picking your own fingers off this basalt.”

I widened my stance slightly. Instead of fighting my nervous system, I silenced the internal interference. My conduits shifted into laminar flow—no turbulence, zero unnecessary friction. Every strand of energy within my astral body aligned into parallel, ice-cold channels.

Then, I reached deeper, down to the foundation that stood entirely outside of magic.

To the soul.

I awakened KAI. The pitch-black, deep void of Gōtai surfaced from within, washing over my right forearm and hand. The dark coat hardened against my skin, forming a gleaming, light-devouring armor with the density of an unbroken monolith. It looked like a gauntlet hewn from indestructible basalt.

Yet that was merely step one.

If Gōtai is an impenetrable shell against magic, it will act as a pressure chamber, I calculated coldly, staring down at my blackened knuckles. If I pump sapphire current beneath the armor of the soul, it won’t be able to bleed into the air. Instead of detonating outward, the plasma will stay locked under the solid black shell. Zero discharge, zero light giving away my position. The entire charge will compress beneath the surface like steam inside a sealed boiler.

I opened the valve in my right conduit.

Dense sapphire plasma surged straight into my hand. The internal collision was brutal. The invisible charge crashed from the inside against the black barrier of Gōtai. My hand immediately began vibrating at a terrifying frequency, and beneath the black sheen ignited a muffled, deep azure glow, resembling white-hot steel cooling beneath a layer of slag. The pressure threatened to snap my tendons. Blood vessels throbbed against the trapped force, and the muscles of my forearm burned with living fire, demanding an immediate outlet.

I clamped my jaw until my molars ground together. I held that boiler shut by sheer, uncompromising will.

The Master didn’t wait for me to stabilize the prototype. He took a single, minimalist step forward. His silhouette blurred, and the bamboo staff snapped straight toward my sternum with a velocity that shredded the morning fog.

I closed the distance.

The Lynx Footwork carried my body in a tight arc to the left. The momentum of the old man’s thrust sailed past my flank, and I collapsed the gap to zero, slipping beneath his guard. My right fist—blackened with Gōtai and rumbling with trapped plasma—drove straight toward the Master’s solar plexus.

Yet I made a novice mistake.

Fearing my own tissue would rupture, I released the black shell two inches before impact.

FLASH!

The prematurely released plasma detonated outward with an ear-splitting crack. A blinding azure thunderclap ripped through the fog, and a violent kinetic backdraft hurled us in opposite directions. The right sleeve of my linen shirt disintegrated in a fraction of a second, drifting down as charred ash, while the stench of scorched earth filled the air. The basalt slab beneath our feet split along a three-yard fault line.

I slammed back-first into the cliffside, landing on bent knees and breathing heavily. My forearm was bruised and scorched from the backlash of my own discharge.

The old man landed lightly on the precipice, killing his momentum with a pulse of his own KAI. He hadn’t budged an inch upon landing, though the very tip of his bamboo staff was lightly blackened with soot.

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”You’re shoving it like a mule up a hill, Dave,” he said dryly, flicking ash from his frayed sleeve. ”Dropping the reins at the final second. You’re terrified your Vessel won’t hold the pressure, so you pop the seal early. The energy belongs inside the target, not out in the open. You drop the armor only when your bone registers the physical resistance of the flesh. Not a microsecond before. Otherwise, you’re just putting on a fireworks show for the rubes.”

I leaned against the basalt block, letting the cool mountain draft soothe the burn along my forearm. Reaching into my pocket, I pulled out a worn copper coin minted back in Oakhaven, lazily rolling it across my scraped knuckles, listening to the dull, rhythmic clink of metal. My breathing steadily leveled out.

”Easy to preach when your own channels aren’t catching fire,” I remarked with easygoing calm, though my mind was already laying down the corrected blueprint.

The issue wasn’t the volume of power. It was synchronization. If I extinguished Gōtai at the exact moment of physical contact, the target’s bone and tissue would become the sole path of least resistance for the compressed plasma. The current wouldn’t blast into the atmosphere—it would be sucked into the victim’s body like lightning into a copper rod. And high voltage pumped directly into a central nerve trunk meant an instant biological short-circuit. Tetanic seizure across every muscle fiber. Complete motor paralysis without tearing away an ounce of flesh.

Far beyond the jagged canopy of black pines, the massive, leaden walls of Crossgard loomed against the horizon. Somewhere down in the Low City, Silas was likely brokering with shadow fences, while Elena and Luthia reinforced our estate. I knew little Ria was absorbing basic alchemy, and Karys was sharpening her shadow instincts. My pack was solid and self-reliant. I didn’t need to hover over them.

The old man walked over to the dying fire pit, sat down on a mossy log, and produced an old wooden pipe. He struck a natural spark with a piece of flint, drawing in the flame and exhaling a slow, dense plume of grey smoke into the cold air.

”Crossgard is rotting from the bedrock up, kid,” the old man said abruptly, his milky eyes fixed on the distant metropolis. ”Underneath those cobblestones run currents that guild mages can’t even put a name to. Those sapphires in your veins... that abnormal density you carry... it hums at the exact frequency of the deepest dungeon floors carved out before the Great Purge. When you start hurling lightning in those streets, you’ll wake things your current frame has no answer for. Subjugation isn’t about mercy. It’s about staying alive.”

”Let them step into my reach first,” I answered coldly, slipping the copper coin back into my pocket. ”Then we’ll see whose mass holds out.”

The Master puffed a final ring of smoke, then drove his bamboo staff deep into the soil beside the embers. He rose slowly, shedding his worn mantle. He stood clad only in a waist-wrap and linen bindings across his forearms. His sinewy, scar-latticed frame radiated an icy, crushing aura of KAI so dense that the frost on the surrounding rocks thickened in an instant.

”Done with the stick,” he said quietly. ”Let’s test it flesh to flesh. If you cause another explosion, I’ll break your fingers so thoroughly you won’t hold a spoon for a month.”

That reckless, razor-sharp smirk found its way back to my mouth. I rolled my shoulders, feeling the tension ease out of the joints, and stepped into the center of the basalt ring.

I silenced everything. Blank canvas in my mind, laminar flow through the conduits, absolute dominance of will over structure. Once more, I bathed my right hand in the void of Gōtai. Pitch-black armor sealed over the skin up to the wrist, forming an impenetrable, lightless monolith. I fed the sapphire current underneath. The hand vibrated violently, but this time I gave it no slack. I clamped down on the pressure chamber with iron discipline. Pure craftsmanship.

The Master assumed no elaborate stance. He stood loose, arms hanging relaxed.

And then, he simply vanished.

No sound of footwork, no displaced gust of wind. The space before my eyes sheared open, and his weathered, iron fist materialized a millimeter from my jaw, carrying the momentum of a falling mountain.

My brain didn’t wait for visual confirmation. Blind instinct and raw biomechanics took the wheel.

I tilted my head back a fraction of an inch, letting the Master’s knuckles graze the empty air beside my ear. In that same heartbeat, I torqued my hips, driving my left heel into a fissure in the rock, and threw a short, linear counter with my right fist straight beneath the old man’s ribs.

Point of contact.

My blackened, reinforced knuckles made contact with the coarse skin of the Master’s flank. I felt the physical resistance of his dense, oak-hard muscle.

Now.

Precisely at the millisecond of impact, across a surface area of barely half a square inch on my knuckles, I extinguished the black shell of Gōtai.

No flash. No thunder. No billowing shockwave.

There was only a muffled, dry, metallic snap—CLACK!—like an electric fence arcing against a steel post.

Compressed under monstrous pressure, the sapphire plasma, finding no escape into the open air, drove straight into the Master’s tissues. An ultra-high-voltage impulse bypassed his KAI reinforcement and hammered directly into the primary neural trunk of his torso. The current found an immediate ground within his biological infrastructure.

The result was clinical.

The voltage shorted out the Master’s nervous system in a single frame. The entire left half of his body locked into an absolute, tetanic seizure. The muscles along his chest, abdomen, and thigh seized into rigid, iron knots, strangling his breath and paralyzing his motor functions. The old man froze mid-motion. His other arm, which had already begun coiling for a lethal hook to my temple, went limp, and his rear leg lost its anchor.

He staggered two unsteady paces back, dragging his locked foot across the basalt, a strained, rasping hiss escaping his clenched teeth.

It lasted precisely four seconds. Only then did a violent, internal surge of his own KAI forcibly clear the neural jam, pushing past the block and restoring sensation to his limbs.

I lowered my hand. The pitch-black armor of Gōtai receded beneath my skin without a whisper, leaving no trace of strain behind. An easy, arrogant calm settled over my features.

”And that’s that,” I said smoothly, sliding both hands deep into my trouser pockets and giving my neck a brief roll. ”Zero collateral damage, spine intact, ribs in one piece, and the target catches a hard system freeze long enough to snap his neck or just walk away clean. Pure engineering on a live wire.”

The Master stood motionless, massaging his bruised flank. In his milky, amber Tiger’s Eyes, there was no longer any trace of reprimand. There was only a cold, profound, and undeniable respect from someone who had just witnessed the birth of a technique that bypassed the established laws of this world.

”You learned to cage the storm under your skin, kid,” the old man said, his voice low and coarse. ”Turned a roaring wildfire into a surgeon’s scalpel. That’s a rare gift. Most fools with your affinity spend their whole lives throwing bigger lightning bolts, convinced that volume equals strength.”

He walked back to the embers, bent down, and retrieved his pipe.

The sun was sinking toward the ridge, casting long, bruised shadows across the ravine. The morning chill gave way to dry dusk air. I figured today’s physical debt was paid—my channels were taxed, my ribs ached, and my stomach was demanding a serious caloric reload. I turned on my heel toward the timber lean-to, ready to call it a day.

Then came the dry snap.

With a callous flick of his thumb, the Master crushed the dying embers in his pipe bowl, grinding the ash into the dirt beneath his bare heel.

He didn’t turn toward the shelter. Instead, he faced the pitch-black, yawning fissure in the basalt cliffside—the mouth of a subterranean cavern that had been exhaling a dead, tomb-like chill since dawn.

”You’ve learned to strike when your eyes can measure the target,” the old man said, and every ounce of warmth vanished from his tone. ”In daylight, any mortal can gauge distance and land a blow on armor. Pleased with your little triumph, are you? Think you’ve mastered the craft?”

He turned his head toward me. Those sightless, clouded eyes felt like they were boring straight through my skull.

”Let’s see what that precision is worth when I strip away the very last photon of light. In there, there is no morning and no dusk. No reflection on water, no silhouettes against rock. And I will not make a sound. Step inside, Dave. And pray that will of yours can see in a vacuum before my bamboo shatters your collarbones.”

The old man took a single step forward and simply dissolved into the cavern’s maw, swallowed whole by an absolute wall of nothingness.

I paused. My smirk faded, my sapphire eye narrowing into a slit. Slowly, I stepped onto the threshold of the cave. The cold hit my bare shoulders like an icy lash. Before me lay total, impenetrable dark—a sterile, pitch-black void where the sense of sight ceased to exist.

I stepped into the dark. The ground vanished from view.

And then, out of the dead, suffocating silence right behind the nape of my neck, soundless and without a whisper of air resistance, the first lethal strike descended.