The ANBU Headquarters — Duel Arena.
At this moment, two masked ninja were locked in combat at the center of the field. One wore a boar mask, his body larger than that of an ordinary man, yet his movements were surprisingly agile as he deftly dodged a storm of shuriken flying his way.
His opponent, wearing a cat-faced mask, had a normal build — nothing in his appearance gave away any clues about his identity.
The Boar Mask and Cat Mask ninja exchanged blows, kunai flashing in their hands as steel clashed against steel. The constant metallic clangs echoed through the silent ANBU hall, sparks dancing in the dim light. Those watching from around the arena held their breath, focused entirely on the duel.
Perhaps because of his larger frame, the Boar Mask ninja possessed superior strength even while maintaining flexibility in his movements. In their close-quarters exchange, the Cat Mask ninja was gradually forced into a defensive position.
"Bang!"
Both combatants broke apart after a fierce clash, pulling back to create distance. The Cat Mask ninja immediately formed a string of hand seals, his fingers blurring with speed as he said coldly:
"Fire Style: Great Fireball Jutsu!"
He inhaled sharply, his abdomen swelling, then exhaled — spewing forth a massive sphere of flame that roared through the air, waves of heat rippling out as the surrounding temperature soared.
As expected of an ANBU ninja, his hand seal speed was far beyond that of an ordinary shinobi.
The Boar Mask ninja had no time to dodge — the Great Fireball was already upon him, impossible to evade.
Yet in that split second, under the astonished gazes of the onlooking ANBU, his right arm suddenly expanded severalfold, turning into the arm of a small giant.
That massive hand opened wide and swung down toward the Great Fireball — the rush of wind was like a thousand horses galloping — and with a single slap, the raging flames were extinguished.
"Multiplication Jutsu!" exclaimed Leo, who had been watching from the stands.
"You recognize that technique?" asked Tengu, glancing at him.
Leo didn't answer. Recognize it? He'd lived with it in his past life, binging Naruto episodes night after night.
The Multiplication Jutsu was a secret technique of the Akimichi Clan, allowing the user to instantly enlarge parts of their body, or even transform into a towering giant.
It existed outside the five basic elemental natures — truly a unique secret art.
Everyone knew that, aside from the five main natures — Wind, Lightning, Fire, Water, and Earth — there also existed Yin Release, Yang Release, and Yin-Yang Release.
By theory, the Multiplication Jutsu belonged to an extension of Yang Release.
"If I could learn that jutsu myself — enlarging at will — and then combine it with Armament Haki, my power would skyrocket," Leo thought.
In One Piece, Luffy's rubber body let him expand his limbs freely, and when coated with Armament Haki, his giant punches were terrifying — each one capable of shaking mountains.
At this moment, the Boar Mask ninja's giant palm extinguished the Great Fireball, and in the next instant he flickered forward with Body Flicker Technique, appearing right in front of the Cat Mask ninja. His massive fist loomed like a boulder.
The Cat Mask ninja broke into cold sweat and raised his hands.
"I yield!"
The Boar Mask ninja had won. Everyone had now witnessed firsthand the might of a secret art user.
The Cat Mask ninja retreated from the field, but the Boar Mask ninja remained standing in the center, clearly intent on holding the stage as the defender.
Having seen the power of his Multiplication Jutsu, the surrounding ANBU hesitated to step up.
"You've got monstrous strength yourself — why not give it a try?" said Tengu.
Leo glanced at him, then slowly walked out onto the arena.
A murmur rippled through the ANBU. Leo's presence was unfamiliar, and his Rakshasa Demon mask was rarely seen — almost no one in ANBU wore one.
They began speculating about his identity, but in ANBU, true identities were secrets, even from one another.
The Boar Mask ninja eyed the newcomer with suspicion but still formed the seal of confrontation, as per duel protocol.
Leo mirrored him, taking his stance silently.
No words were needed — no taunts, no boasting.
With masks concealing their faces, there was no need to hold back.
The Boar Mask ninja moved first — three shuriken shot out from his pouch, spinning through the air in a straight line.
Leo tilted his body slightly and easily dodged them.
"Clang, clang, clang—"
The shuriken embedded themselves into the ground — and in that instant, the Boar Mask ninja vanished with Body Flicker Technique, reappearing in front of Leo with a fierce punch!
A feint — the shuriken were meant only to distract. A classic ninja tactic.
From the man's build and jutsu, Leo quickly deduced that his opponent was indeed from the Akimichi Clan — power-type shinobi, specialists in Taijutsu and strength-based techniques.
That punch stirred the air itself, gusting toward him with crushing force.
"Soru!"
In a blink, Leo used one of the Six Powers — Shave — vanishing with a sharp whoosh.
"So fast!" the Boar Mask ninja muttered, alarmed. He felt an intense force rush from behind and spun around, crossing his arms just in time to block.
"Boom!"
A tremendous impact numbed his arms and forced him back several steps.
Leo also slid back, widening the distance again.
He hadn't even used Armament Haki for that blow — just pure physical strength.
After his recent hellish training, his body had already transformed far beyond that of an ordinary ninja.
"What incredible strength!" the Boar Mask ninja said in disbelief.
"I've already seen your weakness," Leo replied calmly. "Your size grants you speed for a while, but prolonged battles drain your stamina. When your endurance runs low, you can't move as fast — you'll have to rely on Body Flicker alone.
Use that technique from before."
"Hmph… being looked down on, are we?"
The Boar Mask ninja snorted, and his right arm swelled instantly, turning into a gigantic limb once again.
"Dare to face me head-on?"
"Why wouldn't I?" Leo answered.
He darted forward with Soru, vanishing in a blur, and reappeared before the giant.
The Boar Mask ninja swung his massive fist down — the very air rumbled with the force.
"Armament Haki: Hardening!"
Leo didn't dodge. He met the attack head-on!
"BOOM!!!"
A thunderous explosion rang out as their fists collided — one large, one small — neither yielding.
Shockwaves of white air erupted from their clash, spreading outward in all directions.
The ground cracked like a spiderweb, and the entire arena trembled.
But it wasn't over yet — the Boar Mask ninja's other arm suddenly expanded, swelling into another giant limb as he swung it down once more—
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