That is why Reiji brought Yukina to his private research room.
A closed basement, dimly lit by the pale blue light of chakra lamps hanging from the ceiling, with humid air that felt heavy against the lungs.
A stone table engraved with seals filled the room, as if holding ancient secrets waiting to be revealed.
In the air, there was a faint metallic scent—like old blood that lingered, even though it had been cleaned repeatedly.
...
...
...
Days passed in a series of relentless tests.
Yukina remained silent, even as her body was filled with chakra electrodes and measuring seals that crawled like fine lines on her skin.
Yukina was seen sitting motionless in the cold stone chair, not struggling for a moment.
Her eyes stared blankly at the wall, as if her thoughts had escaped far away, leaving the room entirely.
Sometimes Reiji would throw out words in a testing tone, trying to elicit a reaction from Yukina.
But all Reiji received was a small nod or a barely audible whisper—like a faint shadow that was hard to catch.
Reiji found himself wondering.
When they first met, Yukina was sharp and straightforward—her words like a sword always ready to be drawn, piercing without mercy.
Now, Yukina was just silent.
But that silence was enigmatic—not a sign of surrender, but rather hiding something much deeper, like a thick layer of ice tightly frozen beneath the surface of calm water.
During those fifteen days, Reiji diligently recorded and compared every experimental result meticulously.
He even called in several other Yuki Clan ninjas from the Research Area to undergo comparative testing.
The results were undeniable: Yukina had a much denser chakra structure, a flow of energy that was stable and flawless, and a truly unique mutation pattern.
This genetic mutation not only enhanced Yukina's Kekkei Genkai but also triggered extreme physical reactions—Yukina's hair would turn as white as fresh snow, and her body temperature would drop drastically.
A unique and fascinating phenomenon that Reiji witnessed directly from Yukina.
For Reiji, this was not just an anomaly.
It was a crack—a small fissure that might open the way to a new understanding of the true limits of Kekkei Genkai.
In fact, perhaps... a key to creating an artificial Kekkei Genkai.
That idea burned in Reiji's mind, keeping him awake night after night.
Where Reiji flipped through notes with trembling hands, rearranging theory after theory under the dim light, while his eyes reddened from staying up too long—but not once did Reiji think of stopping.
However, all of this was not the end.
Yesterday, Reiji received news from the dark market—through a spy disguised as a Fuinjutsu Explosive Paper merchant.
Some ninjas from Konoha were reportedly coming to the Uzushio Village.
They claimed to bring a diplomatic message.
Wanting to talk about cooperation... and security.
Reiji only smiled faintly upon hearing this.
Not a warm smile—but a cold, bitter smile, with a hint of amusement as if he could already guess what kind of game they would bring.
Where Reiji knew exactly that the faces of those envoys would be polished with fake smiles, sweet words, and small talk more bland than tasteless soup.
And Reiji also knew: if one of them made him annoyed—even just a little—then the negotiations could turn into a fight in an instant.
And as for the outcome?
Reiji wouldn't mind beating them to a pulp—as long as he didn't kill them.
Just enough to make them think twice, then send them back to Konoha in a battered state, with a teleportation seal thrown like shooing away rats from a house.
While contemplating this, Reiji turned back to Yukina, where he stared at her for a moment before finally focusing his thoughts entirely on the unfinished research.
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