Pre-Uchiha Massacre timeline—
"Sasuke, what were you trying to say just now?" Fugaku Uchiha asked what future world Sasuke wanted to say.
Though he wanted more to know intelligence about the Uchiha and the future ninja war, Sasuke seemed to have something extremely important to tell him.
12-year-old Konoha genin Sasuke Uchiha, awaiting team assignment, kept his head down. Facing his father who hadn't yet experienced the Uchiha massacre, he didn't know how to speak to make his father believe him.
"He said—kill Obito Uchiha!"
"!!!!"
12-year-old Sasuke's head shot up!
The person who spoke was...
—17-year-old Sasuke Uchiha from the Fourth Great Ninja War battlefield!!
His even more future self!!
Wait! Future me said to kill Obito Uchiha?? Not Itachi Uchiha?!!
Who the hell is Obito Uchiha?!! He'd never heard that name!!
Coincidentally...
Right before this.
Kakashi Hatake, preparing to pick up his three subordinates, had arrived at the team assignment classroom door.
Kakashi, who thought he'd arrived late, saw that Kurenai Yuhi, Asuma Sarutobi, and others still hadn't left.
His contemporary Might Guy was also there...
Just about to ask what happened, he heard a voice from inside:
"He said—kill Obito Uchiha!"
Kakashi: "!!"
He pushed open the classroom door!! His eyes looked fearfully toward that mirror inside the classroom that could see the future!
Fourth War Sasuke: "Kill Obito Uchiha. Stop this war."
"!!!!" Kakashi along with Kurenai Yuhi, Asuma, Guy, and others were shocked!!
Kurenai Yuhi: "The Obito Uchiha you mentioned—is it the Obito Uchiha we know?!"
"If it's the Obito we know," Asuma said, "he already sacrificed himself on a mission over ten years ago."
Might Guy: "And the war you mentioned is..."
The mirror belonging to their world shifted angle, the view pulling back. They finally saw the full picture of the Fourth Great Ninja War!!
Including the Uchiha and Konoha ninja on the other side also saw...
They saw how brutal the Fourth Great Ninja War was!!
Earlier, the Ten-Tails' 'Heaven and Earth Transformation' used uncountable chakra to disrupt the order of energy in nature, simultaneously triggering earthquakes, lightning strikes, tornadoes, floods, and multiple other natural disasters.
The battlefield terrain was severely destroyed. Scattered rocks split the Allied Shinobi Forces apart everywhere.
Ninja from different villages abandoned their mutual hatred. They stood together supporting each other, combining different jutsu together, fighting the monsters split off from the Ten-Tails.
Their faces were exhausted, gasping heavily for breath, yet getting no time to rest.
The new generation of ninja shone brilliantly.
Countless seniors created opportunities for them! Willing to pave the way with their own lives!
In this moment, hatred and barriers truly disappeared. Even if people from different villages fell beside them, others would rush up to block attacks from Ten-Tails clones for them!
Ninja wearing different ninja uniforms, all wearing headbands with the character for 'shinobi' together, embracing comrades who'd lost their breath in their arms!
Tears in their eyes, yet no time for grief.
Raise hands, swing swords!
Form seals, jutsu!!
As the nearest Ten-Tails clone fell, people from other times finally saw the true opponent the ninja faced in this war!
A monster unimaginably massive!!
Hundreds, thousands of times larger than the Nine-Tails, the most terrifying thing in their understanding!!!
The milky-white semi-transparent pillar called the 'Barrage Wall' suppressed such a massive monster on the ground. The monster called the Ten-Tails struggled to crawl out but was like the Monkey King under Buddha's Five-Finger Mountain, unable to move!!
It roared, continuously splitting off batch after batch of clones.
Each clone required several ordinary jōnin to surround and barely match it.
Yet standing atop that massive monster's head were two men overlooking all living beings, controlling it.
The Reanimation corpse wearing dark red armor over Uchiha clan clothes, with explosive black long hair!
And the black short-haired man with severe distorted scars on his right face, wearing dark purple Uchiha clan clothes!
The teachers in the Konoha genin assignment classroom unanimously recalled that dead-last from their class back then...
And that dead-last's frequent saying: "I'll become the first Uchiha Hokage! I'll carve the Sharingan and my goggles together on the Hokage Rock!"
"Kakashi! Is that really—" Might Guy turned to look at Kakashi, wanting to ask if that was Obito Uchiha.
But when he saw Kakashi trembling all over in shock, murmuring: "O...bi...to...!" those syllables, he realized that person truly was the Obito Uchiha they all knew!
"But why?! Kakashi!"
"Isn't Obito already dead?!"
"Yeah! He sacrificed himself in the Battle of Kannabi Bridge!"
His contemporary friends all looked at Kakashi, unable to pull himself from shock.
Naruto, Sasuke, and the other genin awaiting team assignments also got the general picture from their fragmented words. It seemed a Konoha ninja judged dead had been lurking outside for many years before inciting the future Fourth Great Ninja War!
"Why!" Kakashi: "If you were alive, why didn't you return to Konoha?!!"
Obito's eyes—one black, one purple—merely glanced at Kakashi from another time point in the mirror wall. He was already too lazy to talk to these counterfeits.
At the same time, the 'Land of Waves Great Naruto Bridge 1.0' timeline successfully connected...
"Sharingan, so you also have a kekkei genkai."
This was—
Haku's voice!!
Before Naruto on the Fourth War battlefield could cry out...
"SPLURT—!!"
The sound of sharp objects piercing a body.
"Really... you... always... getting in the way..."
Ninja from the Fourth Great Ninja War timeline, one year before the Uchiha Massacre timeline, and the Konoha genin assignment timeline were shocked!!
Inside the mirror wall was... Sasuke Uchiha's voice...?!
...
Land of Waves 1.0 timeline—
"Sasuke, you..."
Naruto, on his first mission outside the village, froze.
Inside Haku's Demonic Ice Mirrors, he sat collapsed on the ground, eyes full of disbelief looking at Sasuke's back...
...
Fourth Great Ninja War timeline—
The Allied Shinobi Forces who finally got vision inside the mirror wall, along with people from the other two timelines, saw Naruto sitting on the ground while Sasuke Uchiha, who'd blocked all attacks for him, coughed up fresh blood, his body filled with the enemy's senbon!
Sasuke Uchiha once risked his life to save Uzumaki Naruto?
...
Pre-Uchiha Massacre timeline—
Fugaku Uchiha and Itachi Uchiha's Sharingan popped out!!
So many senbon! Nearly a fatal attack!!