Zero-Tails

This can be considered a diary, a record of the life of a man from the Uji Clan.

The Clan Head recognized my abilities, describing me as both cold and insane, the most capable young man in the clan. Insane? I know I am not insane.

The Clan Head decided to groom me as the next successor, and for that reason, I was granted a secret technique.

Yin Release: Hashihime Technique.

Compared to water-style derivative techniques, this is undoubtedly a far more potent water-style secret art.

However, it is too cruel.

Before practicing this technique, I must meet a prerequisite: a close blood relative—my child, or my brother, preferably a daughter or a sister.

I know, I am not insane, but for the sake of power, some things must be done. I set my sights on a woman.

After ten months of pregnancy, that woman bore me a child, a boy. Beyond a sense of inexplicable disappointment, I felt a strange sense of relief...

The situation outside the clan is becoming increasingly dire. It is rumored that the Senju and Uchiha clans have produced two genius young leaders, Senju Hashirama and Uchiha Madara. It is said they are invincible on the battlefield; wherever their blades point, small ninja clans crumble and flee. Influenced by this, surrounding clans are strengthening their forces, and battles are becoming more frequent. To cope with the impact of defeated clans fleeing their territories, I must prepare early.

Madmen, true madmen, the Kaguya Clan are all madmen!!!

Do they not fear death!?

It is just passing through, is it necessary to fight us to the death!? How exactly did Uchiha Madara crush these lunatics!?

Even dealing with retreating soldiers is this difficult. This man is undoubtedly far stronger than I am. It is time to make a decision. With the power of those two, perhaps they can unify this chaotic Warring States period. Sooner or later, they will march here. I must face their power; I refuse to become a stray dog.

I do not know if it was luck or misfortune, but the child I expected was born. When I held her in my arms, she was tiny and adorable. I named her Kyoko.

The child grew day by day, and we spent a relatively happy time together, until the day she turned six and refined her chakra. I knew the time had come.

The Hashihime Technique is a truly cruel art.

That day, while she slept, I locked her in a water prison. During the preparation of the technique, I must never let her see my face; only then is it possible to command her.

For seven days, I stood guard outside the water prison. At first, Kyoko only cried and screamed, calling out for her father, until her voice grew weaker and weaker, and finally, it stopped.

According to the records of the technique, when animals—especially humans—die while harboring intense negative emotions like resentment, despair, and fear, their souls linger briefly in this world. Women, in particular, possess Yin energy, making them better suited as vessels for Yin Release. By seizing this moment, one can capture the soul and create an immortal, true demonic entity.

I walked into the water prison. The last thing I saw was her tiny figure floating on the water's surface, and then, according to the forbidden technique, I resurrected Kyoko.

As I expected, Kyoko did not die; she merely transformed into another form, staying by my side forever. She still calls me "Father" sweetly and thanks me for saving her, saying she loves me the most. I am very happy.

When the Clan Head saw Kyoko, he was also very happy. He said he had once attempted this technique himself, but failed; his daughter had left him forever. My success proved that I could undoubtedly become a qualified Clan Head. That very day, I became the Clan Head. It is wonderful; everything is just wonderful.

Recently, I have begun to have a trouble. The child has grown up and seems to have become rebellious. Kyoko does not obey my discipline well; she does not eat human food properly and is always clamoring, "Hungry, hungry, hungry," with a very violent temper.

I consulted the elder, and he told me that Kyoko does not eat human food; she requires her own exclusive sustenance. Fear, resentment, and hatred are her food. At such times, I only need to let her out to kill.

I was somewhat worried, but with no other choice, I had to follow the elder's instructions.

Kyoko is a natural-born ninja. Regardless of the water-style ninjutsu, she can cast it at will without hand seals. She is extremely powerful. As long as she strikes, the battle ends quickly. Gradually, I stopped worrying about her safety and began to let her hunt alone.

As she grew, Kyoko's bloodlust became heavier and heavier.

Until that day...

After our daughter went missing, my wife was always asking me about Kyoko's whereabouts, over and over again. As the days passed, she became unreasonable and neurotic, always hysterically roaring at me. The look in her eyes no longer held love, but killing intent. After all, she was once an excellent ninja. I could not hold back, and I revealed my killing intent toward her.

Then, Kyoko noticed.

Before I could stop her, she killed her.

I tried to save her, performing the resurrection secret art over and over again, but it had no effect.

On this day, I lost my beloved wife forever.

Then, on another day, I lost my eldest son.

When did it start?

I do not understand. Was it because of jealousy that my brother received my attention?

Just as I do not know when Kyoko developed a penchant for eating people. When I discovered it, she was in the middle of eating her brother.

From this moment on, I think I must have gone insane.

One day, someone told me that the Warring States period had ended and that an era of peace was coming, with Senju Hashirama and Uchiha Madara as representatives, bringing permanent peace to the ninja world.

What a joke... what a joke... what a joke!!!

I do not acknowledge it! I do not acknowledge it! I absolutely do not acknowledge it!

What peace! What ninja village!!! Do you think we are playing a game of house!!!

God of Shinobi!? How arrogant!!!

I curse you! I curse you all! I curse this ninja world!!!

Forever! It will be hell forever!!!

Yura closed the scroll, toying with a summoning scroll and a straw doll in her hands.

The palm-sized straw doll was the true form of the Hour of the Ox Worship venerated by the Uji Clan. Just as toads live on Mount Myōboku, it needed a place to reside. Based on Yura's shallow knowledge of sealing techniques, this looked more like a seal. According to vague mentions in the records, the Hour of the Ox Worship was the final form of Kyoko after she matured, completely abandoning the form composed of water-attribute chakra to become a vengeful spirit lingering in the world.

However...

"This method of utilizing negative emotions... I feel like I've seen it somewhere before..." Resting her chin on her hand, Yura pondered deeply.

Outside, the Hour of the Ox Worship was running rampant, and the screams of ninjas rang out one after another.

"That's right." Yura remembered, muttering to herself, "It's the Zero-Tails..."

It belonged to the Sky Ninja Village. While the Sky Ninja Village was still a minor village in the ninja world at this time, the technique itself was a forbidden jutsu developed by the Second Hokage, Tobirama. It had later been stolen by a fellow from the Sky Ninja Village, along with the Eight Inner Gates.

This technique was a method for creating artificial tailed beasts. It could gather vast amounts of negative emotions, manifest them into a tailed beast-like life form, and rely on the darkness within people's hearts to generate massive quantities of dark chakra.

Comparing the two, the difference was that the former relied on the negative emotions of a single person, which had its limits no matter how great they were, while the latter utilized the negative emotions of a large number of humans, even capable of reaching the scale of a tailed beast.

Tobirama really was ruthless.

"A pity..." Yura clicked her tongue and said, "There is no Hashihime Technique."

This technique was something passed down orally only between the current and previous heads of the Uji Clan for generations, with no written records left behind.

In that case, she would have to find a way to infiltrate Konoha and fleece the Second Hokage, the wicked Tobirama.

As for developing it herself, Yura, who possessed a vast amount of negative emotions but had been struggling for a means to apply them, finally had some ideas after witnessing the ninja's operations.