Hahaha, I'm so sorry, apparently I slipped the initial draft before I translated it into English.
here i will give an additional chapter and thanks to @Ahmad_Aminuddin for translating it to others in english, i apologize profusely and thank you very much
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Three days—neither too long nor too short.
With Satoru Gojo last-minute preparation, those three days passed quickly.
Having adjusted himself to peak condition, Satoru Gojo had already arrived early at the hidden base of the head of the Kamo clan.
Sitting on the sofa, his gaze was fixed motionlessly on an image projected through some kind of technique, his expression unreadable.
"The Nightmare has taken the bait."
Beside him stood a man with stitches across his forehead. Outwardly, he was the newly appointed head of the Kamo clan, but in truth, he was the most evil Cursed User in history. Though his expression was calm, a sinister smile played on his lips as he stared at the Nightmare projected on the screen.
Seeing the Nightmare appear in the image, the sky-blue eyes of Gojo deepened, and his slender fingers tapped the wooden armrest rhythmically.
He took a deep breath, fully aware that what lay ahead would be the hardest battle of his life.
Even more difficult than the time he faced that Celestial Tyrant.
His heart was filled with a heavy sense of foreboding.
Yet, that wasn't the only emotion coursing through him.
There was also blood-pumping excitement—and the thrill of wagering his life like a gambler.
Before meeting the current head of the Kamo clan, he truly had no way to deal with the Nightmare. He had spent his days plagued by headaches, wondering how he could even qualify to fight her.
Gojo was a proud man. He had been since childhood.
It was only natural.
Anyone who inherited the Limitless Technique and the Six Eyes would inevitably become proud and conceited.
After mastering Reversed Cursed Technique and fixing his final flaw, he had truly believed himself to be unrivaled under heaven.
However, whether it was the Limitless Technique or Reversed Cursed Technique, in the face of a time-based technique, they were all pitifully ineffective.
Chronostasis, each of its abilities individually would be enough to establish dominance in the world of jujutsu—but the Nightmare possessed twelve such abilities all on her own.
Time acceleration, time pause, time reversal...
She could even summon alternate versions of herself from different timelines as clones.
Combined with her ability to slip into the shadow of time and her physique that was on par with Gojo, even he, as proud as he was, had to bow before such a figure.
But everything changed after he met the new Kamo clan head.
The plan to eliminate the Nightmare wasn't complex.
The more complicated the plan was against such an opponent, the more likely it would fail.
So, the first step was simple: catalyze one of Sukuna fingers to create a Special Grade Cursed Spirit and use it to lure the Nightmare.
She, who needed to devour others to gain cursed energy, would naturally not miss the opportunity to absorb such a rare Special Grade.
As for the rest of the plan, it was even simpler.
"It's time."
Sensing the moment had come, Satoru Gojo stood up.
The next instant, activating the Limitless Technique, he vanished from the spot and appeared in the same scene as the Nightmare.
In the outskirts of Tokyo, inside an abandoned factory.
Just as the Nightmare was about to eliminate the Special Grade Cursed Spirit before her, Gojo figure suddenly appeared behind it.
He gently placed his palm on the creature's back—and in the next instant, the spirit exploded like an overinflated balloon.
"Isn't this Mr. Gojo?"
Though the situation was unexpected, there was no anger or surprise on the Nightmare face. Instead, she smiled faintly, as if seeing an old friend she hadn't met in a long time.
Retrieving Sukuna finger and teleporting it back to the base, Gojo calmly adjusted his mindset and responded with a smile of his own.
"You must have already guessed—this is a trap meant for you, right?"
"A Special Grade Cursed Spirit appearing in an abandoned, uninhabited factory? What could be more obviously a trap?"
"Haha, true enough." Gojo chuckled dryly. "Initially, I planned to release the spirit in downtown Tokyo, but too many innocent people would've gotten hurt. That's why I changed the location."
"Then you should've also guessed that I knew it was a trap, right?"
"Yes."
"Then why change the location? Isn't luring me in more important than a few lives?"
"Because I believed you're the type of person who would still walk into a trap, even knowing what it is," Gojo said plainly. "If it were me, I'd do the same. That's the confidence of the strong."
"Hehe, that's quite true."
Wearing a luxurious red and black corset gown and a fox mask covering half her face, the Nightmare smiled and added, "Besides, this is something Mr. Gojo has prepared for me personally. Wouldn't it be impolite to leave without at least unwrapping the gift?"
She didn't look like a prey walking into a trap—more like a noble girl invited to a masquerade ball, eagerly opening her present.
"Yare yare, you really don't take me seriously, huh?"
Gojo scratched his head and sighed, "I am the strongest of this generation. Can't you give me some respect?"
"I've already given you plenty, Mr. Gojo," she said with a smile, as if it were the most natural thing in the world. "If it had been anyone else's trap, I wouldn't even bother showing up."
"Is that so? I feel honored all of a sudden."
Gojo lowered his hand.
Then, his laid-back demeanor changed instantly, exuding sharp intensity.
"Well then, Miss Nightmare…"
Gojo took a combat stance, with invisible currents of energy swirling around him. "I hope what I've prepared will catch you by surprise."
The moment Gojo entered battle mode, an invisible force descended upon the area, enveloping the entire factory in a pitch-black barrier.
Far away in Tokyo, the man known as Noritoshi Kamo activated the ritual from his end, linking this makeshift arena to the grand barrier of Master Tengen—the greatest barrier user in history.
[Welcome, duelists, to the Colosseum.]
[Here are the rules of engagement:]
[1. Duelists may not leave the barrier under any circumstances until death decides the outcome.]
[2. No outside help is permitted in any form.]
As the barrier activated, a small golden insect appeared between them out of nowhere.
As the will of the barrier, this tiny golden bug had the power to distort reality itself. Inside the barrier, all must obey the rules it announces.
This was the perfect stage for Satoru Gojo and the Nightmare.
Because this barrier was built upon the Grand Barrier of Tengen—the one that spanned all of Japan.
If one wished to destroy this world, they would first need to destroy Tengen's Grand Barrier.
And aside from Tengen himself, no one was capable of doing that.
Not even Satoru Gojo.
To entertain the audience watching from outside the barrier, the moment before Nightmare could return to her shadow, the reason she hadn't immediately tried to escape wasn't because she didn't want to, but because she was forcibly pulled back by an invisible force—and that force was the will of the barrier itself.
And now, the strongest of the era and the most evil of the era were both locked within the same domain.
In the end, only one of them would walk out.
No matter who that person was, the consequences for the world would be profound.
"What... happened...?"
At the moment the golden insect announced the rules, Nightmare looked at her body in disbelief.
As if affected by some invisible power, her entire existence was being erased like a pencil drawing scrubbed away with an eraser—vanishing from the spot.
Although her body disappeared, her shadow remained beneath her feet.
Like boiling water, the shadow surged under the influence of the barrier's rules—and another Tokisaki Kurumi emerged before Satoru Gojo.
Almost the moment this new Tokisaki Kurumi appeared, Satoru Gojo tensed all his muscles and charged toward her with a swift step.
According to Rule Two of the colosseum: Combatants may not participate through any kind of proxy, meaning familiars, shikigami, or cursed corpses were all unusable.
Only power that truly belonged to the combatant themselves could be used within the colosseum.
In other words, the Nightmare now standing before him must be the true body!
The battle exploded into motion at that instant!
At the same time, the hearts of everyone witnessing the scene couldn't help but clench.
The Great Tengen Barrier was vast enough to cover the entirety of Japan.
Because of this, from the moment the colosseum barrier was established, all sorcerers who knew that Satoru Gojo was going to duel Nightmare today could see what was happening inside—as though they were watching a live broadcast.
This was something Satoru Gojo allowed.
Because if he won, this battle would cement his title as the strongest of this era. No one in the Japanese jujutsu world would dare obstruct his reforms again. He could sweep away the rot of the old age and bring forth a new future for jujutsu.
But if he lost...
Then, everyone would witness just how terrifying Nightmare power was, and all thoughts of fighting her or avenging others would be completely extinguished.
"Gojo-sensei... you have to win!"
At Tokyo Jujutsu High, Yuji Itadori clenched his fingers until his knuckles turned white, eyes locked unblinking onto the projected image.
He and the other students had only learned today that their teacher was going to face Nightmare in a life-or-death battle.
After all, even if they had known beforehand, there would've been nothing they could've done aside from worrying.
Against an enemy like Nightmare, numbers were meaningless—they would only hold Gojo back.
Gojo was used to fighting alone. Suddenly asking him to cooperate would only hinder him from unleashing his full strength.
And in this battle, if Nightmare managed to use her Sixth Bullet—which could return consciousness to the past—then their final trump cards would be exposed, and humanity would lose its last chance to defeat her.
"Ryomen Sukuna... Can Gojo-sensei win?"
On the screen, the two were already locked in a fierce fight.
The battle had already surpassed the level of what Itadori could understand. All he could do was seek answers from the King of Curses sealed inside him.
At this moment, in the spiritual domain conjured by his consciousness, Sukuna sat atop a throne made of bones, watching the battle unfold through Itadori vision as well.
Even in his era, a thousand years ago, battles of this caliber were exceptionally rare.
A Nightmare who could manipulate time, and a Satoru Gojo who controlled infinity—in Sukuna eyes, the latter had no hope of victory.
As much as it pained him to admit, Sukuna understood that even if he himself replaced Gojo and fought Nightmare, he still wouldn't be able to win.
Yes, he might win once, or twice.
But Nightmare, who could reset time endlessly with her Sixth Bullet, would just retry again and again.
Fundamentally, this was an unfair fight.
But the appearance of that barrier changed everything.
"This level of high-level barrier technique... I've never seen such a thing, even in my time." Sukuna said with interest. "I don't specialize in barriers, but I know enough to realize that whoever created this one—even if they had no innate technique—could be considered a supreme force based on their barrier skills alone."
Normally, the creation and control of a barrier relied on the barrier master.
However, this barrier wasn't being controlled by a sorcerer—but by the will of the barrier itself.
And what did that mean?
It meant that the power to alter the rules within this barrier was so immense, it exceeded what a human body could withstand—it was so powerful that it had birthed a consciousness of its own.
It also meant that within this barrier, the rules declared by the barrier's will were absolute.
Rule One: Combatants may not leave the barrier until a life-or-death result is determined.
At first glance, this seemed to simply trap the fighters within an iron cage—but Sukuna noticed something deeper.
Nightmare shadow dimension was also a space outside the barrier.
Which meant that within this domain, Nightmare method of dodging and escaping using her shadow realm was forcibly disabled.
And Rule Two, banning any form of proxy participation, placed all of Nightmare clones on the blacklist.
Her two trump cards were now nullified.
All that Satoru Gojo had to face was a single Nightmare, using Kurumi clockwork angel ability.
It was still difficult—but now, hope was in sight.
After all, Gojo Hollow Technique: Purple did indeed have the power to obliterate Nightmare.
And if... he still had other cards up his sleeve...
"Can he win...?"
Sukuna narrowed his eyes slightly, a flicker of anticipation rising in his heart.
"He will win!"
Within the barrier, amidst the collision of spirit energy and cursed energy, Satoru Gojo roared in his heart.
This was the last chance to destroy Nightmare.
If he missed it, the jujutsu world would fall completely into her shadow.
So, as the strongest jujutsu sorcerer of the era—he cannot lose!
"Nightmare—You and I... let's settle this here and now!"