The Sharingan is the bloodline limit of the Uchiha clan, inherited from Indra, the eldest son of the Sage of the Six Paths. The Mangekyo Sharingan represents its highest sovereign state.
The abilities manifested by the Mangekyo vary depending on the individual. While siblings may occasionally share similar powers, the awakening of the Susanoo—which requires abilities in both eyes—is exceptionally rare.
Generally, the powers of the left and right eyes differ but act in a complementary, synergistic fashion.
To obtain the Mangekyo, legend dictates one must kill the person closest to them. In reality, the core requirement is for one's grief and emotional trauma to reach an absolute breaking point.
This was the hurdle Uchiha Kaede faced. Utilizing the neural network of Shiraishi's main consciousness and the supercomputing power of a simulated emotion system, Kaede was subjected to a myriad of virtual tragedies and psychological shocks.
After three years of intensive "mental tempering," he finally awakened his Mangekyo.
In Shiraishi's internal system, Kaede's data screen displayed two distinct "Awakening Traits" for his eyes.
Because Kaede currently possessed a standard Mangekyo, using these traits placed a staggering burden on his ocular power, leading rapidly toward blindness.
There was only one solution: The Eternal Mangekyo Sharingan.
Shiraishi had once fought the Eternal Mangekyo-wielding Uchiha Madara during a time-slip involving the Dragon Vein.
He knew exactly how terrifying that power was. To evolve, one must transplant the eyes of a close blood relative who has also awakened the Mangekyo.
In all of history, only Madara and the future Sasuke had achieved this, breaking the "curse of darkness" and gaining sight that would never fade.
Shisui and Kaede were first cousins with a bond deeper than brothers. Their eyes were the keys to each other's evolution.
Furthermore, Kaede's awakened traits were of the "Straight Tomoe" (Choku-tomoe) variety—focused on fluid movement and aggressive power—which perfectly complemented Shisui's specialized genjutsu type.
Securing Shisui's eyes was now the linchpin of Kaede's—and Shiraishi's—grand plan.
The Ambush at the Shrine
As the sun dipped below the horizon, Shimura Danzo arrived at the ancient, secluded shrine. He looked at Shisui with a gaze devoid of warmth.
"Even if you use Kotoamatsukami to control Fugaku and suppress the clan's dissent," Danzo said, tapping his cane, "the village elders will not simply let this go. What then?"
Shisui shook his head. "The Third Hokage gave his word. Things will change."
"Hiruzen is a dreamer," Danzo countered, stepping closer. "The suspicion in this village cannot be washed away so easily. I, for one, am a man of many doubts. If you cannot change the village, will you eventually use that eye on us?"
The question struck Shisui's core. In that moment of hesitation, Danzo lunged. Shisui reacted instantly, his Mangekyo spinning to trap Danzo in a paralyzing genjutsu. "I'll release you once I'm clear..."
Shisui turned to leave, but Danzo materialized behind him as if by magic. In a blur of motion, Danzo's hand plunged forward, ripping the right eye from Shisui's socket!
Izanagi. The ultimate forbidden jutsu of the Uchiha, which Danzo had somehow acquired. By sacrificing a hidden Sharingan, he had turned reality into a dream, negating Shisui's genjutsu and repositioning himself for a lethal surprise attack.
Shisui recoiled, clutching his bleeding face. As Danzo raised the bloodied eye, preparing to transplant it, the ground beneath them suddenly erupted in violet flames.
The Arrival of the Secret Eye
The air grew heavy with an ominous, scorching chakra. Out of the darkness stepped a masked figure. The man's right eye glowed with a Mangekyo pattern strikingly similar to Shisui's—yet subtly different.
"This man... he isn't Itachi," Danzo muttered, his guard rising. Was this the mastermind behind the Nine-Tails incident four years ago?
Shisui looked at the masked intruder. Despite the blood and the pain, a wave of profound sorrow washed over him. He knew that chakra. He knew that stance.
Is even... even you after my eyes?
Shisui had always known Kaede was hiding his true strength, but the reality of it cut deeper than Danzo's blade.
The Fuma Shuriken pattern in Kaede's right eye spun with violent intensity, activating his specific Mangekyo trait.
"Secret Art: Land of the End!"
The ground didn't just burn; it boiled. A wave of absolute, incinerating heat swept over the ancient shrine, turning the battlefield into a literal purgatory. Kaede, masked and cold, stared down both the thief and the victim.
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