In the canon of Naruto, the climactic battle between Itachi and Sasuke Uchiha ends with Itachi’s gentle forehead poke and his death from illness. He had orchestrated everything so that Sasuke would awaken his own Mangekyou Sharingan and become a hero. But what if, in a moment of desperation or broken resolve, Itachi chose a different path? What if he killed Sasuke and took his eyes to achieve the Eternal Mangekyou Sharingan? This chilling theory unravels a timeline where brother kills brother with no redemption, and the fallout reshapes Konoha’s destiny forever.
Itachi’s True Motives – A Desperate Sacrifice?
Canon Itachi loved Sasuke more than anyone, but he also carried the immense burden of protecting Konoha from the shadows. As his sickness progressed and his vision dimmed, he might have concluded that Sasuke was not strong enough to carry on his will. Faced with the looming threats of Obito, the Akatsuki, and the unresolved cycle of hatred, a desperate Itachi might rationalize the unthinkable: kill Sasuke, harvest his eyes, and obtain the Eternal Mangekyou. With that power, he could personally eliminate all threats to Konoha forever. In his twisted logic, one more sin would secure peace. This act would shatter his psyche, transforming his love into a cold, obsessive drive for “justice.”
The Eternal Mangekyou Awakens – Power Without Purpose
After transplanting Sasuke’s eyes, Itachi’s Mangekyou evolves into the Eternal form. The blinding pain stops, his illness is halted, and his chakra stabilizes. He gains the Perfect Susanoo—a towering armored warrior with the Yata Mirror and Totsuka Blade at full, sustainable power. On paper, Itachi becomes nearly invincible. But the emotional trauma corrupts him. The moment he killed Sasuke, the very reason he clung to sanity vanished. His mind fractures. He begins to see Konoha not as the home he swore to protect, but as the root of the suffering that forced his hand. The Elders, Danzō’s schemes, the clan’s massacre—all of it boils into a nihilistic rage. The Eternal Mangekyou only amplifies his pain, and his new purpose becomes erasure: he will purify the world through destruction, starting with the village that demanded the ultimate sacrifice.
The Fall of the Akatsuki – And Rise of a New Threat
Before turning on Konoha, Itachi would cleanse the Akatsuki. His Perfect Susanoo would overpower Kisame, Deidara, Hidan, and Kakuzu with brutal efficiency. His greatest challenge would be Obito, still posing as Madara. With Kamui’s intangibility, Obito is a tricky foe, but Itachi’s intellect and the unyielding defense of the Yata Mirror could allow him to force Obito into a decisive blow—perhaps setting up a Tsukuyomi trap that Obito cannot escape. Nagato’s Rinnegan might prove more difficult, but a weakened Nagato controlling the Six Paths would still fall to a sustained Susanoo assault and the Totsuka Blade. With the Akatsuki dismantled, Itachi becomes the sole wielder of unimaginable power. There is no one left to restrain him, and his bloody gaze inevitably turns toward the distant silhouette of the Hokage Monument.
Konoha’s Darkest Hour – Impact on the Village
The Konoha of this timeline is unprepared. Without Sasuke’s defection, Naruto’s rivalry and drive are diminished; he may never develop his Sage Mode or bond with Kurama as quickly. The village is still recovering from the Konoha Crush and lacks the jinchūriki’s full strength. When Itachi arrives, he does not attack outright—he issues an ultimatum: hand over the Elders and the Hokage for execution, or face oblivion. Tsunade refuses, and Itachi unleashes hell. His Perfect Susanoo sweeps across the village, the Totsuka Blade sealing countless shinobi in a drunken dream. Kakashi, Might Guy, and other elite jonin put up a valiant fight, but against the Eternal Mangekyou’s illusions and Susanoo’s might, they are overwhelmed. Guy may open the Eighth Gate, but Itachi’s Yata Mirror could potentially deflect that final blow. One by one, Konoha’s pillars fall. In a cruel irony, Itachi uses Tsukuyomi to force the Elders to relive the Uchiha massacre over and over until their minds break. The Will of Fire flickers and dies in the shadow of a perfect warrior who was once its greatest secret protector.
A World Without Hope? – Long-Term Repercussions
With Konoha shattered, the shinobi world loses its strongest stabilizing force. The other hidden villages, seeing Itachi’s rampage, either cower in fear or band together in a desperate alliance. Naruto, having lost his home and his friend in one catastrophe, might still rise, but without Sasuke as a mirror, his growth would be stunted. Kurama might seize the opportunity to break free, leading to a cataclysmic tailed beast battle. Itachi, now a hollow shell of vengeance, would likely turn his Perfect Susanoo against the other villages, seeking to erase the entire system that created his pain. The cycle of hatred would spiral into an age of darkness, with no Sage of Six Paths to intervene. The Akatsuki’s “Eye of the Moon” plan pales in comparison to this one-man apocalypse. Konoha’s destruction would echo across the entire Naruto universe.
Conclusion: The Anchor of Love
In canon, Itachi’s love for Sasuke was his last tether to humanity. Killing his brother would have severed that anchor, turning him into a monster far worse than Madara. Konoha would not just fall—it would be utterly erased, along with the fragile peace it represented. This dark what-if reminds us that sometimes, even the most tragic choices can prevent a far greater catastrophe. Itachi’s sacrifice of his own life was, in the end, the only thing that saved the world from his own potential for destruction.