The Beginning and End

Two years ago.

Uchiha Yu's ninja squad, formed with Haku, had one of the Sannin, Orochimaru, as their lead Jonin. They completed an A-rank mission on their first outing, though a Jonin was added later to assist.

However, after Madara Uchiha's departure, the Uchiha clan, eager to regain influence in Konoha's power structure, seized this opportunity to forge a connection with Orochimaru, a disciple of the Hokage.

They offered Yu substantial support, granting her access to all clan ninjutsu and essentially unlimited supplies. This was also the source of the Explosive Tags Yu later used to fake her death, pretending to perish alongside a ninja from the Kaguya Clan and their Shikotsumyaku.

During that period, while studying ninjutsu scrolls in the clan's ancestral hall, Uchiha Yu stumbled upon a stone tablet.

According to the Uchiha clan's elder, only those who had awakened their Sharingan could see the contents of the tablet. The higher the level of the Sharingan, the stronger the user, and the more they could perceive.

What I saw was indeed different from what other Uchiha clan members saw.

According to clan records, others saw how to evolve the Sharingan. I could see that too, and even more than what was recorded in the clan documents.

The highest Sharingan form recorded in the clan was the Mangekyo Sharingan. However, I also saw the Eternal Mangekyo Sharingan beyond that, and even how to achieve the legendary Rinnegan was recorded on the stone tablet in the Uchiha ancestral hall.

At this point, Uchiha Yu paused, considering her words before continuing.

Besides seeing these contents, I also saw information hidden within them, or rather, someone had altered the original content of the stone tablet to what it is now.

Huh? Haku was surprised. You could see that too?

I saw the existence of a being named Kaguya Otsutsuki, the progenitor of chakra sealed on the moon.

The key to breaking the seal is the Rinnegan.

Later, based on some clan records, I believe Madara Uchiha is not dead. He likely obtained the key to evolving the Sharingan into the Rinnegan during his final battle with the First Hokage: the cells of the Senju clan.

After I saw that stone tablet, I constantly felt like I was being watched.

Listening to Uchiha Yu's slow narration, Haku understood why she had come here.

The feeling of being watched after Uchiha Yu saw the stone tablet was not a delusion. She was indeed being watched, or rather, anyone who saw that stone tablet was being monitored.

Yu's guess was also correct; Madara Uchiha was indeed not dead. He was here, in the Graveyard of Mountains in the Land of Rivers. The one watching him was a clone of a black and white humanoid creature.

It was also that guy, who called himself White Zetsu, who actively contacted her and offered her an irresistible deal: a pair of Sharingan, a pair of Sharingan belonging to her father.

Her father had encountered Madara Uchiha by chance while on a mission outside, followed him for a period, and after his death, his eyes were recovered by White Zetsu.

Through White Zetsu, Uchiha Yu learned many secrets of the ninja world from Madara Uchiha, as well as many secrets of Konoha.

She learned that Haku's situation was not good, especially after Orochimaru became the one abandoned, a casualty on the path to becoming Hokage.

Haku's situation would worsen as a result, and coupled with the Hokage faction's suppression of the Uchiha, their combined situation would become even more dire.

Therefore, wanting to avoid burdening Haku further, she decided to leave Konoha and train with Madara to become stronger. Once her strength was sufficient, she would return to support Haku.

Thus, with the help of White Zetsu, she faked her death and came here, staying by Madara Uchiha's side to train.

Before leaving, she specifically left her Sharingan behind, thinking that her Three Tomoe Sharingan should provide Haku with a significant combat advantage.

Huh? Your eyes?

Speaking of the Sharingan she left for Haku, she was slightly shocked.

Do you also have Uchiha blood? How can you control the switch for the Sharingan? People without Uchiha blood who transplant a Sharingan will always have it in its activated state.

Hmm, I don't know either. After I transplanted your eyes, they returned to their unactivated state. Now I've cultivated them back.

Haku didn't reveal the truth to Uchiha Yu's confusion, instead giving an answer he himself didn't understand. At the same time, he activated his One-Tomoe Sharingan.

Uchiha Yu didn't pry further into the changes that occurred after Haku transplanted her Sharingan.