Two years ago.
Because Uchiha Yu's ninja squad, which she had formed with Haku, was led by one of the Sannin, Orochimaru, and because they had completed an A-rank mission on their very first assignment—though it was later upgraded when a Jonin appeared—
the Uchiha clan, which had always wanted to return to the center of Konoha's power after Madara Uchiha's departure, naturally did not let this opportunity to build a connection with Orochimaru, the Hokage's disciple, pass them by.
They gave Yu tremendous support. All the clan's ninjutsu were made available to her, and various supplies were provided more or less without limit. This was also where the Explosive Tags later used by Uchiha Yu to fake her death and stage a mutual destruction with a Shikotsumyaku user from the Kaguya Clan came from.
During that period, while Uchiha Yu was studying ninjutsu scrolls in the shrine, she happened to notice a stone tablet in the Uchiha shrine.
According to the Uchiha clan's First Elder, only those who had awakened the Sharingan could see the writing on the tablet. The higher the Sharingan's level and the greater one's strength, the more content one could see.
[I did indeed see content that differed from what the other Uchiha had seen.]
[According to the clan records, the others saw how to evolve the Sharingan. I could see that as well, and I even saw more than what was recorded by the clan.]
[The highest-level Sharingan form recorded by the clan was the Mangekyo Sharingan. But I also saw the subsequent Eternal Mangekyō Sharingan, and even records of how to attain the legendary Rinnegan on the stone tablet in the Uchiha shrine.]
At this point, Uchiha Yu paused. After considering it for a moment, she continued.
[Besides that content, I also saw information hidden beneath it. Or rather, someone had altered the tablet's original contents into what they are now.]
Hmm? Haku was astonished inwardly. She could even see that?
[I saw an existence named Kaguya Otsutsuki on it—the progenitor of Chakra sealed on the moon.]
[The key to breaking the seal is the Rinnegan.]
[Afterward, based on some records within the clan, I came to believe that Madara Uchiha hadn't died. He must have used his battle against the First to obtain the key to evolving the Sharingan into the Rinnegan: the Senju clan's cells.]
[After I saw that stone tablet, I constantly felt as if I were being watched again.]
Listening to Uchiha Yu's slow account, Haku also understood why she had come here.
The feeling of being watched after Uchiha Yu saw the stone tablet had not been an illusion. She really had been watched again—or rather, everyone who had seen that tablet had been monitored by someone.
Yu's guess had also been correct. Madara Uchiha truly had not died. He was in the Graveyard of Mountains in the Land of Rivers, and the one watching him was a clone of a black-and-white humanoid creature.
That same person who called himself White Zetsu had taken the initiative to contact her and offered her a bargaining chip she could not refuse: a pair of Sharingan, taken from her father.
Her father had encountered Madara Uchiha by chance while carrying out a mission outside the village. He had followed Madara for some time, and after her father died in battle, White Zetsu recovered his eyes.
Through White Zetsu, Uchiha Yu learned many secrets of the Shinobi World from Madara Uchiha, as well as many secrets of Konoha.
She knew that Haku's situation was actually quite poor, especially once Orochimaru became the one who was abandoned—the sacrifice on the road to becoming Hokage.
Haku's situation would inevitably worsen as well. On top of that, with the Hokage faction suppressing the Uchiha and Yu forming a team with Haku, things would become even worse.
So, not wanting to become an additional burden for Haku, she decided to leave Konoha and come here to train and grow stronger under Madara. Once her strength was sufficient, she would return and stand up for Haku.
Thus, with White Zetsu's help, she faked her death and escaped, coming here to train at Madara Uchiha's side.
Before leaving, she deliberately left her Sharingan behind, hoping that her Three Tomoe Sharingan would be able to provide Haku with some powerful Combat Power.
[Hmm? Your eyes?]
When she mentioned the Sharingan she had left for Haku, she showed a hint of surprise.
[Do you also possess Uchiha blood? How can you control the activation and deactivation of the Sharingan? People without Uchiha blood who transplant the Seeking Wheel Eye will remain in an awakened state permanently.]
[Well, I don't know either. After I transplanted your eyes, they returned to their inactive state. This is the level I've cultivated them back to now.]
Facing Uchiha Yu's confusion, Haku did not reveal the truth. Instead, she gave an answer whose cause she claimed not to know, while activating her own One-Tomoe Sharingan.
Uchiha Yu did not investigate the changes that had appeared after Haku transplanted the Sharingan.
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