The mission was still incomplete when Adult Obito vanished before the two Hokage. In his place appeared the Edo Tensei Fourth Hokage Minato, Minato from the Kannabi Bridge Timeline, and Adult Kakashi. The moment Minato found himself before the First and Second Hokage, he glanced at his student and immediately knew that Obito was hiding something from them.
The two Hokage sensed it as well but chose not to confront him directly.
Young Obito's Kamui's Dimension, while more fitting to his personality and entirely different from the Masked Man's, posed no major issues. The Fourth Hokage, Minato from the Kannabi Bridge Timeline, and the Adult Kakashi subsequently left one by one.
Then, the Adult and Young Obito reunited within Kamui's Dimension.
"The mission isn't complete?! Weren't you so confident?"
"Tsk. I underestimated the bond between the First Hokage and Madara Uchiha," Adult Obito mused. "Let me think... Madara might have some special code with the First Hokage."
Just as both were at a loss, a turning point emerged regarding Naruto Uzumaki.
During a joint class training session, Young Obito voiced his concern about whether the body of Kakashi from a parallel world—trapped in Kamui's Dimension by the Masked Man—might decompose.
Naruto, sharing an ice pop with Sasuke, suggested, "Get a bigger freezer?"
"I considered that, but Kamui's Dimension has no power supply."
Sasuke responded, "Add more ice?"
"Regular ice melts too quickly." Obito shook his head. "That won't work either."
Regular ice won't do...
Naruto suddenly blurted out, "Then use special ice, dattebayo!"
Before anyone could grasp his unexpected plan, Naruto led them to a place next to their lodgings...
—The Missing-nin Inn?!
"What do you want, brats?" Zabuza opened the door, seeing the entire group of kids from the two classes gathered.
Naruto didn't beat around the bush. "We need Haku's help. We want him to freeze Kakashi-sensei's body."
"Kakashi's dead?!" Zabuza's voice was loud enough that Captain Yamato, who was walking down the hallway to greet the kids heading out to play, froze upon hearing the devastating news. His face blanked for half a second before Naruto and the others were met with the heart-wrenching wails of this Konoha jōnin.
"Senpai!! Senpai!! Kakashi-senpai, how could you... leave us so suddenly..."
The burly man wept. "If I'd known this would happen, I should've paid the bill last time at the izakaya!" He berated himself.
"Senpai, I'll never forget all you did for me... sniff... I'll even bring you your favorite sanma fish during holidays," he vowed silently.
"........" The students from both classes were speechless. Captain Yamato was a kind-hearted man, but sometimes he took things a bit too seriously.
"Kakashi-sensei is still alive!" Sakura couldn't hold back any longer and shouted, then explained the reason to Yamato, Haku, and Zabuza.
Hearing news of 'Yagura Karatachi' again, Zabuza never imagined it would be under these circumstances. It really was...
Damn it, moron.
Haku, hearing Naruto's request, couldn't bring himself to refuse. Coupled with his kind nature, he readily accepted the commission.
Sasuke: "But Kakashi's body is with the masked man, right?"
"No, it's in my personal space." With that, the young Obito entered his Kamui's Dimension through the Uzumaki, delivering the good news to the adult Obito residing within.
The adult Obito promptly retrieved Kakashi's processed body from his Kamui's Dimension. Carrying the body of the adult Kakashi from the other world, he placed it before Haku.
Haku deftly fashioned a luxurious ice coffin using Ice Release.
Watching Kakashi-sensei lie peacefully in the ice coffin, his hands folded across his chest, Sakura couldn't resist pulling a snow-white flower from the vase beside him and placing it gently in his hand.
When Adult Kakashi retrieved the body of Kakashi from the other world...
Were it not for the tattered Konoha ninja attire on the figure within the coffin, it could easily have passed as a prop for a Sleeping Beauty or Snow White stage play...
Truly... marvelous.
So much so that Adult Obito stared at the returned corpse for a long moment, utterly dumbfounded.
Young Obito was equally speechless, though there was little he could do about it.
"Have you figured out how to complete that A-rank mission?"
"I have an idea I want to try."
"I no longer have a reason to distract Minato-sensei and Kakashi-sensei for you."
"Just greet the First and Second Hokage, then pull them into your Kamui's Dimension."
"But that'll blow your cover! They'll know you're impersonating the old man." Young Obito fretted over his future self's astonishingly low IQ.
Adult Obito remained unruffled, "It's just a test. At least we'll learn the trick to impersonating Madara in front of the First Hokage."
Reluctantly, the young Obito Uchiha once again became an accomplice.
After communicating with the two Hokage, Obito absorbed them into his Kamui's Dimension. The First and Second Hokage once again encountered the Uchiha youth who had failed to impersonate Madara Uchiha last time.
"I've figured it out—your secret code with Madara Uchiha."
His direct statement left Edo Tensei Hashirama speechless.
What secret code could he possibly share with Madara?!
Adult Obito continued: "Last night, I replayed every memory of Madara Uchiha's encounter with you."
As he spoke, the adult Obito's mind replayed Madara's journey: from childhood friendship with Hashirama Senju, to repeated clashes on the battlefield in their youth, then leaving Konoha only to return...
"Hashirama, it's been a long time."
"Hashirama!"
"Hashirama!!!"
"Hashirama..."
"Hashirama, I never imagined our dreams..."
"Hashirama----!!"
Though Madara Uchiha's voice had changed significantly over the years, one thing remained constant: each time they met, he would begin by calling Hashirama by name, and Hashirama would do the same.
"Hashirama----!"
"Madara----!!"
Though he felt a bit embarrassed shouting each other's names like this, Obito Uchiha could find no other code word at the moment. He had transformed into Madara Uchiha's form before the Edo Tensei Hashirama Senju and Edo Tensei Tobirama...
Meanwhile, before the young Obito, the Edo Tensei Fourth Hokage was smiling at him. Young Obito trembled, as if the Edo Tensei Fourth Hokage had already seen through him.
"I don't know when I'll have to return to the Pure Land. Before I go, could you take me to see him?"
Young Obito instantly surrendered, sending this parallel world's Minato-sensei into his Kamui's Dimension, then following him in.
...
Upon entering, they witnessed the First Hokage and 'Madara Uchiha' performing as if in a stage play. Both were clad in crimson armor: one wielding a great sword, the other holding a Gunbai Uchiwa and a scythe...
"Hasshirama----!!"
"Madara----!!"
Shouting, they charged toward each other!
Over there, the Second Hokage tapped his forehead, shaking his head with a sigh. Big brother's childish ways truly never change, even unto death. Getting this into a role-playing game...
Seeing Young Obito bring the Edo Tensei Fourth Hokage, Tobirama Senju greeted them. The Fourth Hokage, reincarnated from Edo Tensei, was first stunned by the scene before him.
Then, upon hearing the Second Hokage explain that Madara Uchiha was impersonated by the adult Obito, and learning the full story behind that A-rank mission... His face turned so crimson it seemed like dirt was crumbling off. The reincarnated Minato joined the Second Hokage in holding his forehead and sighing.
Adult Obito, not being the real Madara Uchiha, quickly found himself at a disadvantage against both the First Hokage, Hashirama Senju, and even the Edo Tensei version of Hashirama Senju.
...
After the battle ended, Adult Obito glanced at the spectators watching the fight. He noticed that Minato-sensei and his younger self had somehow appeared among them. His expression froze instantly, and he even instinctively wanted to flee into his Kamui's Dimension.
"Wait, Obito!" Minato Namikaze called out just in time.
The Adult Obito still tried to flee, but...
Edo Tensei Fourth Hokage: "Your body is emitting fluctuations of that Space-Time Ninjutsu I mentioned!"
"Huh?!"
This statement instantly froze the fleeing Adult Obito. The mission was complete?! He glanced at the First Hokage—the man clearly knew he wasn't Madara Uchiha, right?
Regardless, whether the mission was complete wasn't for them to decide.
Adult Obito opened the mission scroll. There—
[Mission Rank: A-rank]
[Mission Content: Impersonate Madara Uchiha and converse with Hashirama Senju.]
["Mission Status: Completed."]
"Sure enough, it shows the mission completion mark!" Young Obito was puzzled. "How did you complete the mission?"
"Um..." Adult Obito replied, "I just transformed into Madara Uchiha's form, saw Lord First, and immediately charged forward shouting his name."
The Edo Tensei Hashirama awkwardly scratched his face. "Even though I knew it wasn't Madara, after all these years, it was just a reflex—I shouted Madara's name and charged forward."
What a reflex.
The Edo Tensei Tobirama Senju: "The mission reward for an A-rank mission is time travel, right?"
Young Obito nodded stiffly. Because last time, they had time-traveled with the entire Kamui's Dimension.
"I... I'll go check outside..."
"No, we should go together," the Adult Obito stopped him. "What if you time travel to some dangerous moment and die there? Then we'd be stuck here forever!"
"....."
If only it weren't for me. If only I hadn't been outmatched.
The Young Obito thought, vowing to beat the crap out of this grown-up version of himself!!