Tobirama and Nagi were flipping through the manga.
When they reached the scene of Naruto and Sasuke's first battle at the Valley of the End, they suddenly realized something—
According to the timeline shown in the story, the Uchiha Clan Massacre seemed to occur this very year… on a certain evening when Sasuke had night study at the Academy.
Night study?!
Tobirama and Nagi's hearts both skipped a beat.
There was no time to verify whether the manga was real.
Nagi immediately rushed out the door, sprinting toward the Uchiha compound.
[Mei Terumī: Hm? Why did the handsome young man suddenly change expression?]
[Ōnoki: Probably something urgent.]
[Fourth Raikage (A): Urgent? What could possibly make even the Second Hokage change his expression?]
[Izuna Uchiha: Wait… Sasuke had night study. Could this be the night my Uchiha clan was annihilated?!]
With Izuna's reminder, the shinobi across the world quickly realized—
On the night of the massacre, Sasuke indeed had night study at the Academy.
[Sasuke Uchiha: There's no mistake… no mistake at all. This is that night!!!]
Nagi rushed to the outskirts of Konohagakure and used the Transformation Technique to assume the appearance of an adult. He then put on the special mask Tobirama had once crafted—designed to counter the Sharingan's visual prowess.
As he approached the Uchiha compound, he immediately caught the scent of blood.
He accelerated.
When he reached the entrance, bodies lay scattered across the ground.
Whatever reason Itachi Uchiha may have had for carrying out the massacre—this act was worse than that of a beast.
Nagi immediately dashed toward the Konoha Military Police Force Headquarters. Even if he hadn't witnessed the massacre firsthand, the Police Force should have been able to hold out for a while.
But as he reached the entrance, a masked man stepped out from inside.
Blood dripped from the blade in his hand.
Tobirama and Nagi both understood.
They were too late.
"What's going on? Itachi Uchiha had an accomplice?"
(Sasuke's memories never showed the masked man. Nagi and Tobirama only knew of the massacre from Sasuke's perspective.)
The white screen had never shown Obito—only Sasuke's viewpoint.
[Ōnoki: What?! Itachi had an accomplice?!]
[Fourth Raikage (A): A thirteen-year-old wiping out his entire clan alone? I wouldn't believe it.]
[Zabuza Momochi: Heh. I thought Kirigakure's graduation ritual was brutal enough. Didn't expect someone even more ruthless.]
[Minato Namikaze: If I'm not mistaken… that masked man is the one who caused the Nine-Tails' Attack.]
[Naruto Uzumaki: What?! Then isn't Nagi in danger?!]
Madara Uchiha narrowed his eyes.
So it was Obito…
He had always foreseen the Uchiha's downfall after they chose the comfort of village life over his ambitions—but he hadn't expected Obito to be the one to carry it out.
Within the Akatsuki, the members silently watched Itachi.
Itachi remained expressionless, as though everything unfolding on the screen had nothing to do with him.
Deidara squinted. "Doesn't that masked guy look a bit like Tobi?"
Obito's heart tightened.
"Haha, Deidara-senpai, how could that be? I'm just an Akatsuki trainee. How could I be some cold-blooded killer like that?"
"Yeah, I guess that's true."
Hidan, meanwhile, looked at Itachi excitedly.
"Didn't know you enjoyed killing that much, Itachi! Want to join Lord Jashin's faith?"
Itachi remained aloof.
Sasori and Kakuzu, who didn't know Tobi's true identity, also began connecting him to the masked man.
Kisame, however, had known all along.
Elsewhere…
After casting Tsukuyomi on Izumi Uchiha, Itachi tearfully ended her life.
(This version follows the novel portrayal rather than the anime adaptation.)
He steadied himself and slowly walked toward his home.
At the Police Headquarters—
"Teacher, should we act?" Nagi asked.
After sensing the masked man's chakra, Tobirama spoke gravely. "He's an Uchiha as well."
Nagi felt disgusted. How many monsters has the Uchiha clan produced?
"Nagi, switch with me. Hiruzen has likely noticed by now. We only need to stall him."
"Understood, Teacher."
Tobirama gradually took control of the body.
Soon, Nagi's eyes sharpened.
Nagi (Tobirama Mode)
VS
Mysterious Masked Man
The battle began.
As the masked man turned to continue slaughtering the remaining Uchiha, Tobirama struck first.
"Water Release: Water Bullets!"
Streams of compressed water shot forth like high-velocity rounds, bombarding the masked man.
But the water passed straight through his body.
No damage.
"Hm? There's someone else here."
[Minato Namikaze: That intangibility technique is extremely difficult to counter.]
[Ōnoki: I never expected such a troublesome ability to exist.]
[Hiruzen Sarutobi: Minato defeated him by striking at the instant he materialized to attack.]
[Fourth Raikage (A): So the key is attacking when he strikes?]
[Mei Terumī: Then speed would be decisive.]
[Kakashi Hatake: No… perhaps he can't remain intangible indefinitely.]
[Hiruzen Sarutobi: If so, wide-range and sustained ninjutsu could help determine his time limit.]
Across the Shinobi World, powerful figures began calculating how they would defeat such an opponent.
The masked man suddenly appeared in front of Nagi in a blur, blade raised.
Instantly—
"Water Release: Water Formation Wall!"
A circular barrier of surging water formed around Nagi.
Yet the masked man phased straight through it, reappearing behind him in an instant—
And cleaved Nagi in half.
But the severed body exploded.
"Shadow Clone Explosion!"
At the same time, Itachi—who had just killed his parents—heard the distant blast and looked toward the Police Headquarters.
"Did he run into trouble?"
He immediately headed in that direction.
As the smoke cleared, the masked man's clothes were tattered from the blast—yet his mask remained completely unharmed.
He tore off a ruined sleeve.
"I underestimated him."
Tobirama observed carefully.
The masked man became vulnerable only when attacking.
Given his experience, Tobirama quickly formed a theory.
If this intangibility is a Mangekyō Sharingan ability… then it must have limits.
"All Mangekyō techniques have constraints. If so, he cannot remain intangible forever."
Just then—
Itachi appeared behind Nagi and launched a sneak attack.
"Fire Release: Great Fireball Technique!"
A massive fireball roared forward.
"Water Release: Water Dragon Bullet!"
A towering water dragon materialized and collided head-on with the flames.
Steam erupted, rapidly enveloping all three in dense mist.
Relying on their Sharingan's kinetic vision, Itachi and the masked man scanned their surroundings—
But Nagi was nowhere to be seen.
As the mist began to thin and the two regrouped—
Several kunai suddenly shot toward them from behind.
[Izuna Uchiha: Damn it! That move again!]