After Uchiha Hikari arrived, Tobirama Senju began explaining the specific steps.
"First, have Hikari use Eight Thousand Spears to completely drain Nagato's chakra."
That's right—completely drain it.
Dry as a bone.
Just like Kakashi during the Pain invasion, exhaust all chakra until near death or even death.
Because only under these extreme conditions can we simulate the situation Makoto described, where Madara's Rinnegan reverted to Sharingan after Kaguya drained all his chakra and left him dying on the floor.
Of course, Madara's reversion to Sharingan might also involve the Asura and Indra chakra that constituted his Rinnegan being siphoned away simultaneously.
But there's no need to worry about filtering that.
If we had to specifically filter out Asura and Indra chakra, it would be nearly impossible.
But taking all chakra together in one package? No filtering required.
There are actually many people capable of absorbing chakra.
Those who can only absorb Ninjutsu (Preta Path) are average tier.
Those who absorb chakra itself—like the Class Rep's little pet Nue in Boruto anime—seem to only drain people until they're exhausted, rarely to death.
But in reality, that's only because naturally kind-hearted girls like Sumire and Hikari subconsciously leave their victims a way to survive.
Now, they need Hikari to completely drain someone dry, and she's certainly capable of being ruthless if she tries.
Furthermore, Nagato himself is particularly important.
If they replaced him with anyone other than Uchiha Madara, the conditions couldn't be met.
Because Nagato had the Rinnegan implanted since childhood, the Rinnegan's chakra signature and his own chakra have long since merged.
This allows Nagato to retain the Rinnegan even after death when reincarnated through Impure World Reincarnation.
Uchiha Madara's case is quite peculiar.
Even as the original owner of the Rinnegan, he still required Kabuto's specially crafted body modifications to transform his Edo Tensei eyes from Mangekyō to Rinnegan.
If we compare the Rinnegan to a child: It's as if Madara gave birth to a child, raised it for less than half a year, then dumped it on Nagato.
Nagato raised the Rinnegan through thick and thin for over thirty years.
Genetically, the Rinnegan indeed belongs to Madara.
But when it comes to emotional closeness and compatibility? No further explanation is needed.
Chakra clearly possesses such special memory attributes.
While absorbing the chakra, Makoto needs to use Natural Energy to maintain Nagato's vital signs—they can't let him actually die from having his chakra completely drained.
At the same time, this Natural Energy would also serve as a "Key" to stimulate the unlocking of the eyes' previous evolutionary stages.
"It must be done by externally absorbing chakra."
"Using various Rinnegan abilities can also consume chakra, but according to Nagato's description, when the Rinnegan's usage reaches a critical low, it begins to drain the user's life force to replenish itself."
"In that case, even if he were drained to death, the Rinnegan would stay active. I suspect this might be a hidden safeguard left by the inherently evil Uchiha Madara to prevent others from mastering the Rinnegan or reverting it."
Tobirama Senju finished explaining his diabolical plan.
"What kind of wording is this..." Uchiha Hikari muttered under her breath, looking disgusted.
Phrases like "drained to death" and "exhausted dry."
If it weren't for her shared dislike of the Uchiha clan in general, and the fact that she still disliked Hashirama Senju and Madara Uchiha—that pair of annoying gay lovers—more than the pragmatic Tobirama, she wouldn't have wanted to help him with this "Account Theft" scheme.
"Then, let's begin."
Makoto handed a stone to Nagato.
"Huh?" Tobirama was puzzled.
Hadn't he just said the stone wasn't necessary for the eye evolution?
"Stop 'huh'-ing. Second Hokage, think about it: even if we successfully unlock the 'Account Theft,' won't Nagato need to expend a great deal of energy to use those powers afterward? He needs a battery."
"True. I overlooked that." Tobirama nodded.
He had been so excited about hacking into Madara's eyes that he hadn't considered the server costs of using the stolen admin privileges.
Nagato lay on the laboratory bed—no anesthesia, no restraints, just lying there accepting his fate.
"We can begin now."
"Hmph."
At Tobirama's command, Uchiha Hikari snorted coldly, her Mangekyō Sharingan spinning into life.
The Eight Thousand Spears mark she had previously left on Nagato—originally intended to control him and force Rinne Rebirth—now glowed brightly on his skin.
Having followed Makoto's advice, Nagato had previously absorbed the chakra from the Eight-Tails' severed limb, replenishing his body's depletion with some to spare.
As a member of the Uzumaki Clan and a vessel selected by Madara to sustain the Rinnegan, his chakra reserves were naturally immense.
However vast, they still couldn't compare to the Dragon Vein Hikari had drained before.
Absorbing this chakra posed no pressure at all.
Whoosh.
As his chakra was completely drained, Nagato felt an unprecedented weakness wash over him.
But the Natural Energy infused by Makoto instantly replaced the essential energy required for survival.
For now, the energy composition in Nagato's body was identical to Makoto's—entirely Natural Energy.
However, Nagato couldn't maintain this state naturally.
As a ninja of this world, extracting chakra from cells was instinctive. Even non-ninjas possessed chakra within their bodies.
And the moment chakra appeared, it would disrupt the balance of Natural Energy.
The current balance was maintained only because Hikari's Eight Thousand Spears was frantically vacuuming—the moment a trace of chakra emerged, it was instantly siphoned away.
Makoto's control over Natural Energy was extremely precise.
Until Natural Energy was needed as a key to unlock the Rinnegan, no matter how much chakra or energy the Rinnegan lacked, the Natural Energy remained firmly in place, completely inert.
Thus, as Nagato's chakra was thoroughly drained...
The Rinnegan finally simulated the state of Uchiha Madara on the verge of death and began to degenerate.
The concentric ripple pattern dissipated, reverting to the state of the Mangekyō Sharingan.
"Good! Excellent! Now! It's time!"
Tobirama Senju's voice was filled with fanatical excitement.
This was the first time he had shown such fervor since being revived.
Perhaps it was because he had seen this familiar Mangekyo pattern.
The thought of immediately hijacking Madara's eyes was even more exhilarating than killing Izuna!
Makoto began releasing a controlled flow of Natural Energy, channeling it into Nagato's eyes.
As the Natural Energy flowed in, the parched eyes once again received an infusion of power.
The eyes, which had begun regressing further toward the three-tomoe Sharingan, instantly stabilized into the form of the Mangekyo Sharingan.
"Nagato, try it now." Makoto spoke to the motionless Nagato.
He could sense the eyes still urgently craving more Natural Energy to push back into the Rinnegan state, but Makoto's extraordinary control allowed him to regulate the output precisely, freezing them in the Mangekyo stage.
"..."
Nagato's body was extremely weak at this moment.
This weakness wasn't about physical strength or vitality—after all, the Natural Energy was sustaining his life perfectly.
This weakness came from the constant draining and replenishing of power.
Like a helpless battery being rapidly charged and discharged over and over.
Thud.
"It's done."
Seeing a faint blue skeletal ribcage manifest around Nagato's body, knocking over a nearby surgical table, Makoto knew they had succeeded.
Eye Hijacking Complete!