The training grounds buzzed with activity as soldiers and villagers gathered in a large crowd. Word had spread quickly: the prince himself would be teaching a new way of fighting.
Kairo stood barefoot in the center of the sandy arena, his eyes sharp and focused. Though he was only eight years old, an unmistakable air of authority surrounded him, enough to silence the entire crowd the moment he raised his hand.
"Listen carefully,"
Kairo began, his voice steady and clear.
"Strength alone will not win every battle. If you only rely on power, you'll be crushed by someone faster… or smarter. What I will teach you today is how to use your body as a weapon — efficiently, precisely."
The men and women exchanged curious glances. They were strong, yes, but the idea of fighting with fists and movement alone felt completely foreign to them.
Kairo clenched his small fists, then demonstrated with smooth, practiced motions — jab, cross, hook. His fists cut through the air with surprising speed.
"This is called boxing. Quick strikes aimed at vital points. Guard your face, guard your body."
He motioned for a volunteer. A burly soldier stepped forward with a smirk.
"Your Highness, can such small fists truly hurt?"
Kairo smiled confidently.
"Let's see."
The soldier raised his hands lazily. In the next instant, Kairo darted forward — a sharp jab to the nose, followed by a clean hook to the ribs, then a swift retreat with perfect footwork. The soldier staggered back, stunned, clutching his side.
Gasps rippled across the field.
Kairo raised his hands again, voice calm but firm.
"Strength is nothing if you don't know where to strike. This is the art of fists."
He spread his stance, lifted his knee, and threw a swift kick into the air, immediately followed by a sharp elbow strike.
"And this,"
he continued,
"is Muay Thai. The art of eight limbs — fists, elbows, knees, and shins. With this, your whole body becomes a weapon."
He drilled them for hours. Jabs, crosses, kicks, knees — over and over. Even the toughest soldiers were soon drenched in sweat as Kairo barked instructions like a seasoned master, correcting form and pushing them harder.
At the end of the day, the King himself watched from the balcony above, astonishment clear in his eyes.
"This child… he isn't just strong. He is shaping our future."
Kairo stood panting but smiling, wiping sweat from his brow.
So that figure gave me more than just intelligence. It gave me talent. If I share all I know, then one day… this kingdom will be unstoppable.
Among the dozens of trainees, one boy stood out.
Leonhart.
He wasn't the tallest, nor the strongest — but every strike Kairo taught, Leonhart repeated flawlessly. His fists snapped like thunder, his footwork flowed like water. Within a week, he moved as if he had been training for years.
Kairo narrowed his eyes as he watched.
This is my friend Leonhart… he learns faster than anyone else. Even I didn't expect this.
During sparring, Leonhart faced soldiers much older than him. A feint with his left hand, a quick pivot, then — CRACK — his elbow landed squarely on the soldier's jaw. The man stumbled back, dazed, while the crowd erupted in cheers.
The King stroked his beard, watching closely.
"Kairo, this Leonhart — he is special. He may be the sharpest blade in your arsenal."
After training, Leonhart approached Kairo and bowed respectfully.
"Prince Kairo… these techniques you taught us, they feel… natural to me. My body just understands. But you… you are the one who opened my eyes. I want to fight by your side forever."
Kairo smirked and placed a hand on Leonhart's shoulder.
"Then train harder than anyone else. If I'm the flame, you'll be the sword forged in it. But remember, Leonhart…"
His gaze sharpened.
"Talent without discipline is just wasted potential."
Leonhart nodded, his eyes burning with fierce determination.
In his mind, Kairo thought:
So this is Leonhart… he might become even stronger than me one day. But instead of fearing it, I'll use it. A kingdom needs not just one hero — but many.
The training grounds slowly emptied as the sun began to set, but the echo of strikes and the spark of new possibility lingered in the air.
Kairo stood quietly for a moment, watching Leonhart walk away with renewed purpose.
The future was starting to take shape — one fist, one lesson, one unbreakable bond at a time.
During a break after training, Leonhart approached Kairo with a calm smile.
"Prince Kairo,"
he said, placing a hand over his chest in a formal noble greeting,
"you remember me, right? My name is Leonhart. I met you yesterday… uhh, sorry if I made you feel like you had dementia or something. I am the son of the Duke, and… thank you, Kairo, for being friends with someone like me."
Kairo blinked, then smiled sheepishly.
"Ohhh… now I remember. You were there at the banquet last year, right? Sorry, I… didn't recall your name immediately because of my long sleep."
Leonhart chuckled softly.
"No offense taken. After all, you've just awakened from a year-long coma. It's only natural. Even though we met just some days ago, I hope you are recovering well."
Kairo scratched his cheek, embarrassed.
"Still… I should've remembered. My bad."
Leonhart's smile widened.
"Then I'll make sure you never forget it again. From now on, you'll hear the name Leonhart often — whether in training, in battle, or in friendship."
Kairo grinned at his confidence.
"Heh. I like that. Then let's see if you can keep up with me, Leonhart."
The training field buzzed with excitement as Kairo and Leonhart stepped into the center ring. Soldiers, servants, and even the King himself gathered around, curious to see how the young prince and the duke's son would fare against one another.
Kairo loosened his shoulders, his eyes sharp but playful.
"Well then, Leonhart. You've shown everyone your skill… but I want to see it myself. Show me what you've got."
Leonhart drew a steady breath and lowered his stance with perfect form.
"As you wish, Kairo. But don't expect me to go easy just because you're the prince."
The crowd murmured in anticipation.
"Begin!" the instructor barked.
Leonhart lunged first, his fist shooting forward like lightning. Kairo tilted his head just enough to dodge, the wind of the punch brushing his cheek.
Fast!
Kairo countered with a sweeping kick, but Leonhart blocked it with his shin and immediately followed with a sharp elbow strike. Their movements blurred together — fists clashing, kicks echoing like thunder across the field.
Gasps erupted from the onlookers.
"These are kids?!" one soldier whispered.
"They move faster than most adults!" another added.
Kairo smirked mid-fight.
"Not bad, Leonhart. You've got talent."
Leonhart returned the smirk, his eyes burning with determination.
"And you've got strength. But talent and strength together… I'll make them mine."
For a moment, Kairo's instincts sharpened — the mysterious contract pulsing faintly in the back of his mind, feeding him flashes of techniques. He stepped in, landed a clean jab to Leonhart's chest, and sent him staggering back.
But Leonhart didn't fall. He steadied himself, grinned, and rushed in again.
The clash of fists and willpower continued until the instructor finally raised his hand.
"Enough! The spar ends here!"
Both boys stood in the center, panting but grinning at each other.
"You're strong, Kairo," Leonhart admitted.
"And you're dangerous, Leonhart," Kairo replied with a smile.
The crowd cheered loudly. The King laughed heartily from his seat, clearly delighted by the spectacle.
This is the beginning of something, Kairo thought. A rivalry… and a friendship that could shape the kingdom's future.
As the spar ended, Kairo felt a strange warmth pulsing in his chest. His bruises, his aching bones, the sharp sting in his knuckles — all of it suddenly melted away.
A soft green aura seeped from his body, radiant and gentle, wrapping him in its glow. The crowd gasped.
"What is this light?!" "Is it… healing magic?" "But humans can't use advanced magic like that!"
Kairo blinked in surprise. Wait… this isn't normal. Am I… doing this?
Without thinking, he stepped toward Leonhart, who was clutching his ribs and breathing heavily. Kairo placed his hand on Leonhart's shoulder. The green aura spread instantly, knitting skin, soothing muscles, and restoring strength.
Leonhart's eyes widened as the pain vanished. He flexed his arm in disbelief.
"This… this is incredible. I feel completely fine!"
Kairo let out a small laugh, lowering his hand.
"Yeah… I don't know why, but it was fun, Leonhart. Fighting you — it made my blood boil in a good way."
Leonhart smirked, the fire of rivalry glowing brighter in his eyes.
"Heh… if this is only the beginning, then I can't wait to see how far we'll go. Next time, Kairo… I'll win."
Kairo grinned.
"Well, let's see. If you're on the right path, I'll lose. If you're lost, I'll always win."
Leonhart tilted his head, confused but amused.
"I don't know what you're saying, but okay. I'll remember that."
The King stood from his throne-like seat, his voice booming across the field.
"Marvelous! Not only has my son found a rival, but a comrade. This bond will shape the future of the kingdom."
The green aura flickered once more, then faded, leaving excited whispers among the soldiers.
Kairo and Leonhart stood side by side, breathing heavily but smiling.
A new chapter had begun — one of rivalry, friendship, and the quiet promise of growth.
And deep down, Kairo knew this was only the first spark of something much greater.