My physique was dangerously lean, every muscle fiber densely packed and optimized by Karla Kure's brutal regimen. But standing next to the towering, blood-soaked mass of muscle that was the "Iron Demon," I looked exactly like what I was: a high school student who had taken a very wrong turn.
The sharp-eyed referee blinked, completely stunned. He lowered his megaphone, staring at me as if I were a hallucination.
"Hey. Hey, kid," the referee barked, waving his hands dismissively, his face twisting into an angry scowl. "Get the hell out of here. This ain't a playground or a manga convention. Go home before you get yourself killed, seriously."
The surrounding crowd and corporate gamblers immediately caught on. The underground arena erupted into a deafening chorus of ridicule and laughter.
"Is this a joke?!" an executive in a tailored suit yelled, pointing his cigar at me.
"Someone get the honor student his milk and cookies!" a tattooed thug jeered, slapping the hood of a nearby car.
"Ten seconds! I give the kid ten seconds before his head pops off like a bottle cap!"
In the center of the arena, the Iron Demon spat a glob of bloody saliva onto the concrete. He rolled his thick, tree-trunk neck, a cruel, mocking grin stretching across his scarred face. He looked down at me, his eyes filled with absolute contempt.
"Look at this," the giant rumbled, his voice like grinding gravel. "A little pretty boy. What's wrong, kid? Get rejected by your high school crush and decided to end it all? I'll snap your arms like twigs, but I'll make sure to leave your pretty face intact so your mommy can recognize the body."
I stood my ground, my posture entirely relaxed. I didn't raise my fists, and I didn't look the slightest bit intimidated. Instead, I casually raised my right hand.
Clutched in my fingers was a thick, banded stack of cash I had pulled from my bag before stepping into the light. My saved up monthly.
I tossed the heavy stack of bills right at the referee's feet. It hit the concrete with a heavy, satisfying *thud*.
"Two million yen," I stated, my voice smooth, calm, and carrying perfectly over the jeers of the crowd.
The laughter in the garage instantly died down. The executives and the enforcers stared at the money, then back up at me.
"That's the current purse, isn't it?" I asked politely, looking directly at the referee. "I'm matching it. Winner takes the entire pot. No rules. I tap out, or I get knocked out."
The referee stared at the cash, completely bewildered by the sheer audacity. "Kid, you're out of your mind..."
I turned my gaze away from the referee and looked up at the Iron Demon.
"You don't need to worry about my safety," I said, a polite but utterly condescending smile curving my lips. "I watched that last match. If the rest of his fights are as slow and sloppy as that one, taking this money is going to feel like absolute charity."
The giant's mocking grin vanished instantly, replaced by a surge of pure, violent rage. The veins in his thick neck bulged.
"You little shit!" the Iron Demon roared, taking a threatening step forward.
"Are we going to fight?" I taunted smoothly, settling into a loose, orthodox boxing stance, the kinetic energy already coiling in my legs. "Or are you just going to keep barking like a dog?
The referee looked at the cold, calculating look in my eyes, then down at the two million yen sitting on the concrete. He scooped up the cash, stepping back toward the edge of the headlight-illuminated ring. He raised his arm high into the air.
"No rules! Winner takes all!" the referee bellowed. His arm dropped. "Begin!"
The Iron Demon didn't immediately charge.
Instead, he let out a low, guttural laugh and dropped his hands entirely. He widened his stance, puffing out his massive, heavily scarred chest and flexing his tree-trunk arms.
It was a pure, arrogant provocation. He was relying entirely on his monstrous durability and overwhelming physical strength, inviting me to try and hurt him.
In response, I tightened my guard. I fell into a flawless, textbook orthodox boxing stance. Chin tucked securely behind my lead shoulder, knees slightly bent, my weight perfectly balanced on the balls of my feet.
For a split second, the underground arena was dead silent.
Then, the giant lunged.
Despite his massive size, his explosive power was terrifying. He closed the gap in an instant, throwing a wild, looping right hook aimed directly at my temple. It was a strike that could easily cave in a normal man's skull.
My Attribute 6 Perception caught on. The punch was telegraphed, but the sheer speed and mass behind it were immense. I executed a sharp slip, ducking a fraction of an inch beneath his massive forearm. The wind pressure from the missed strike violently rushed over my hair.
Using the frictionless pivot of my 6 Dexterity, I planted my lead foot. I snapped a lightning-fast one-two combo—a stiff jab to the solar plexus followed by a devastating cross to his ribs.
*Thwack! Thwack!*
The impacts sounded like a baseball bat hitting a wet sandbag.
I expected his breath to catch. I expected his nervous system to falter. Instead, the Iron Demon merely grunted, the thick layers of heavily conditioned muscle absorbing the kinetic shock. Before I could retract my right hand, the giant twisted his torso, turning my own momentum against me.
He threw a brutal, sweeping backhand.
I barely had time to bring my forearms up in a cross-guard. The impact was like getting hit by a speeding truck. The sheer kinetic force shattered my guard and launched me backward. My bare feet skidded violently across the rough concrete, tearing the skin on my soles before I managed to dig my heels in and stop my momentum.
My arms went completely numb for a terrifying second. A sharp, stinging pain erupted across my cheek where his knuckle had grazed my skin through my guard.
The crowd erupted into a deafening roar of bloodlust, completely thrilled to see the arrogant high schooler finally get put in his place.
I lowered my arms, taking a slow, measured breath. I reached up and wiped the side of my face with my thumb. It came away smeared with bright red blood.
I stared at the blood on my thumb for a second. Then, something inside me clicked.
Karla Kure's brutal, agonizing training hadn't just changed my muscles. It had systematically broken down my natural human survival instincts and replaced them with something entirely different. Curses were chaotic and monstrous, but this? This was pure, distilled martial combat. For the first time in my new life, I was facing a human opponent whose raw power completely eclipsed my own, forcing me to utilize every single ounce of my technique just to survive.
A slow, fierce smile spread across my face, entirely unbidden. My blood was pumping like battery acid. The thrill of the fight was intoxicating.
"What are you smiling at, you little freak?!" the giant roared, charging me again.
"Just realizing how much fun this is!" I laughed, pushing off the concrete and meeting him head-on.
The fight devolved into a high-speed, breathtakingly violent clash. The Iron Demon was a wrecking ball, throwing devastating haymakers, sweeping kicks, and desperate grapples that forced me to constantly retreat and evade. Every time his strikes hit the concrete or grazed my guard, I could feel the bone-rattling shockwaves.
But I didn't break.
I leaned entirely into my Advanced Hand-to-Hand and Boxing skills. I became a ghost in the headlights. When he threw a wide hook, I wove under it, burying a surgical uppercut into his floating rib. When he tried to grapple and crush me in a bear hug, I broke his grip with sharp, brutal elbow strikes to his forearms and radial nerves, destroying his grasping strength.
It was an exhausting, fiercely technical struggle of precision against overwhelming power. I was sweating profusely, my muscles burning from the sheer effort of parrying and redirecting his massive weight, my chest heaving for air. I was taking grazing hits, accumulating bruises and scrapes, but my smile only grew wider.
The Iron Demon was a walking fortress of meat and bone. Every time my fists connected with his torso, it felt like punching a stack of wet tires. His muscle density was absurd, acting as organic armor that absorbed the blunt force of my strikes before they could reach his organs.
If this were a battle of attrition, I would lose. My Level 5 Constitution gave me incredible stamina, but one solid, clean hit from him would shatter my ribs. I needed to end this, and I couldn't do it by simply battering his body.
I needed to break his architecture.
As I slipped under another whistling clothesline of a punch, I analyzed his rhythm.
His raw strength was his greatest weapon, but it was also his fatal flaw. To generate that world-ending power, he had to completely commit to his strikes. And just as I had mocked earlier—every single time he loaded up a heavy blow, he planted all his weight onto his lead left leg, anchoring himself to the concrete.
It was time to spring the trap.
I deliberately slowed my footwork down by a fraction of a second. I let my guard drop by just an inch, feigning the heavy, sluggish movements of a fighter running out of gas.
The Iron Demon's bloodshot eyes widened with predatory glee. He smelled blood in the water.
"You're done, kid!" he roared.
He took the bait perfectly. He lunged forward, throwing his entire massive body weight into his front leg. He planted his left foot onto the concrete with a heavy *thud*, anchoring himself to deliver a devastating, wide overhand right meant to separate my head from my shoulders.
To the roaring crowd, it looked like I was trapped.
But my Level 6 Perception saw the entire sequence unfolding in slow motion.
Instead of stepping back to dodge—which is what he expected—I violently stepped *inside* his guard. I ducked deep under the incoming overhand right, the wind from his massive fist violently ruffling my hair.
Now, I was completely inside his space. And his left leg was locked out, bearing the entire weight of his forward momentum.
Switching seamlessly from orthodox boxing to my Advanced Hand-to-Hand combat, I raised my right foot and delivered a brutal, driving stomp directly to the side of his locked left knee.
*CRACK.*
The sound of his joint buckling echoed sharply. I didn't break his leg, but I completely destroyed his structural integrity.
With his anchor point collapsing, the Iron Demon's own massive forward momentum violently betrayed him. His balance shattered entirely. His massive upper body pitched forward and down, his face dropping right into my strike zone.
He had no guard. No balance. And his brain was no longer protected by layers of flexing muscle.
I planted my feet firmly on the concrete, establishing a perfect kinetic chain. From the balls of my feet, up through my rotating hips, through my core, and down my arm—I channeled every single ounce of kinetic energy my Level 6 Dexterity could generate.
I unleashed a flawless, devastating right uppercut.
My knuckles connected dead-center with the point of his jaw. The precision was surgical. It wasn't about raw power; it was about the violent, sudden rotation of his skull. The impact snapped his massive head back, viciously rattling his brain against the inside of his cranium.
The biological "off-switch" was hit.
The Iron Demon's eyes instantly rolled back into his head, showing only the whites. The ferocious tension in his massive body completely evaporated. All hundred-and-twenty kilos of dead weight collapsed forward, crashing onto the concrete floor with a deafening, earth-shaking *BOOM*.
He didn't twitch. He was out cold before he even hit the ground.
The deafening roar of the underground arena was instantly snuffed out. The silence that followed was absolute, heavy, and stunned. The executives froze with their cigars halfway to their mouths. The yakuza enforcers stared in wide-eyed, terrified disbelief at the high school student standing over their fallen champion.
I slowly exhaled, rolling my right shoulder and shaking out my stinging knuckles. A few drops of blood trickled down my cheek from the earlier graze, but my fierce, adrenaline-fueled smile remained.
"Like I said," I called out, my voice breaking the dead silence as I looked directly at the stunned referee. "A horribly inefficient stance. I'll take my money now."
The referee swallowed hard, his face pale. Without a single word of argument, he hastily gathered the massive stack of two million yen, plus the arena's matching purse, and carefully handed the thick envelope to me.
I turned my back on the fallen giant and walked calmly back into the shadows toward the concrete pillar.
Mai was standing exactly where I had left her. She was clutching my blazer and school bag tightly to her chest, her violet eyes blown wide in absolute shock. She looked at the blood on my cheek, then at the unconscious giant in the ring, and then finally at the calm, polite smile on my face.
"You..." she stammered, completely at a loss for words. Her hands were trembling. "You really just... did that."
"I told you I needed the sparring experience, Senpai," I chuckled, casually sliding the thick envelope of cash into my bag before taking my white dress shirt from her. I began buttoning it up over my bruised ribs. "Besides, I couldn't exactly lose. I have a very important client relying on me to fix her problem this weekend."
Mai stared at me, her initial horror slowly melting into a complex mix of awe, relief, and exasperation. She let out a long, shaky breath, her shoulders dropping as the tension left her body.
"You are," she whispered, shaking her head, "the absolute most terrifying, infuriating junior I have ever met."
"I'll take that as a compliment," I grinned, slipping my blazer back on. "Now, come on. Let's get you to the estate before my curfew hits."