Make sure you read the prologue first before beginning.
...
Yuki opened his eyes to the sound of birdsong—clear, crisp, and unfamiliar.
He blinked slowly, adjusting to the warm light filtering in through the window. The ceiling above him was wooden, not tiled like the apartment he used to know. The smell of tatami mats and morning dew lingered in the air. Everything felt foreign.
And yet, somehow… he felt at home.
Rising from the futon, Yuki's body felt light and strange. His limbs were small, his center of gravity lower. He staggered slightly as he stood and made his way to a dusty mirror propped against the wall.
A young boy stared back at him.
Pale, almost silver-blue hair framed his soft features, shimmering faintly where it caught the sunlight. His eyes were dark—nearly black—but not lifeless. They held a quiet sharpness, a reflection of the swordsman within.
'This… is me now?'
Before he could process more, a digital chime echoed in his mind, and a translucent window appeared before his eyes:
Name: Yuki Kazanari
Age: 6
Kekkei Genkai: Frostfire
Jutsu: Flying Raijin, Body Flicker, Chakra Blade Enhancement
Yuki stared at the screen in awe. The system had followed him here. It wasn't a dream. This was real.
His heart swelled with gratitude. He may not have been in control of this body for the first six years, but the original Yuki hadn't been idle. Through inherited memories, he saw flashes—training in secret behind the orphanage, flickering across the training field, and practicing chakra infusion on a dull wooden blade.
'He was talented… and determined. Just like me.'
But what stood out most—what sent a thrill down his spine—was the kekkei genkai.
Frostfire.
A dual-nature chakra release unlike anything in the original Naruto world. Through it, he could control both fire and ice—not separately, but as two aspects of the same chakra nature. He could choose to manifest the heat or the cold, seamlessly flowing between the two.
In battle, that meant deception. His chakra would always feel the same, whether it was forming a flame or freezing into an icy shard. Opponents wouldn't know what was coming until it hit them.
Already, his mind spun with ideas. Flame-coated blades, freezing winds mid-slash, or ice that melted into scalding steam mid-air. The possibilities were endless.
From that day forward, Yuki threw himself into one thing and one thing only:
Training.
Twelve hours a day, every day. It began with reacquainting himself with the sword—his soul's oldest companion. Though the body was young and unrefined, his muscle memory and instinct transformed each practice session into rapid growth.
Once the blade felt like an extension of his arm again, he turned to chakra control. Starting small—channeling chakra to his feet, climbing walls, walking on water. Then came shaping: forming chakra threads, sharpening it around his blade, and controlling the temperature.
It was grueling. Exhausting. But it was heaven compared to the life he left behind.
His control over Frostfire improved rapidly. He could now form crude weapons from ice, things like needles and even small kunai. With intense focus, he learned to coat his sword in fire-chakra without burning the blade, fusing the chakra blade enhancement jutsu with his kekkei genkai.
By the end of his first year at the Academy, he was already miles ahead of his peers.
His instructors noticed.
So did the village.
When the second year began, Yuki was moved into a specialized elite training program: a class reserved for future jonin candidates, where only the most promising students from each batch were placed.
There, the real competition began.
Children from powerful clans—the Senju, the Hyuga, even the Uchiha—stood beside him. Each with talent, lineage, and expectations on their shoulders.
But even among them, Yuki stood out.
His skill in kenjutsu was unparalleled. No one could match him in sparring, not even the clan heirs. His bladework was smooth, flowing, and deadly precise—his sword striking like lightning, or sometimes, like a silent snowfall.
Even more impressive was his growing chakra pool. By age seven, he was already matching the reserves of the kids from clans known for their high chakra reserves. That, combined with his technical mastery, made him a force beyond his years. He began to be compared to the likes of Kakashi and Itachi but he didn't pay it any mind, he had a goal and he would reach it no matter what.
When the curriculum introduced jutsu training, Yuki seized the opportunity. He quickly mastered the Fireball Jutsu, a staple of most Uchiha. The jutsu gave him the opportunity to utilize his fire in more than just his swordsmanship, building a foundation he hoped would help him flourish in the future.
He showed similar excellence with Body Flicker, refining it to the point that instructors thought he'd already learned advanced teleportation.
'If only they knew…'
In secret, Yuki was slowly practicing the Flying Raijin technique granted to him by the system. It was complex—far beyond anything a normal Academy student should be capable of. But every now and then, in an isolated training ground, he would mark a target, focus deeply, and attempt to warp.
So far, he'd only succeeded twice—just short bursts. But the feeling was unmistakable.
The other students had started to notice, too. Some admired him. Others grew envious. A few even feared him.
But Yuki paid no mind. He wasn't here to be liked. He was here to become strong—strong enough to protect himself, strong enough to forge his destiny, and maybe... strong enough to finally live a life worth being proud of.
At night, he would stare at the stars from his orphanage rooftop, hand resting on the hilt of his wooden sword, now reinforced with chakra. He would whisper quietly to himself, almost like a vow.
'This time... I won't waste my gift.
This time, I'll become more than just a prodigy.
I'll become a legend.'