Yuji Itadori, fifteen years old, was originally just an ordinary student attending Miyagi Prefectural Sugisawa Third High School. Both his parents had passed away, and his only remaining relative, his Grandpa, had also recently died.
Of course, to say he was ordinary wasn't entirely accurate; at least his physical abilities far exceeded those of a normal human.
He was inherently kind and brave, possessed strong empathy and high emotional intelligence. He had an optimistic and cheerful personality, valued life greatly, and believed that life should end in a reasonable way, not by accident.
Because of a finger of the King of Curses, Ryomen Sukuna, found by a senior in his school club, the "Occult Research Club," he unexpectedly encountered Cursed Spirits and Jujutsu Sorcerers, things ordinary people wouldn't encounter.
To save his senior and the Jujutsu Sorcerer who was about his age, he swallowed Ryomen Sukuna's finger, gained Cursed Energy, and killed those Cursed Spirits. However, he also became possessed by Ryomen Sukuna.
Fortunately, his body was unusual, allowing him to forcibly suppress Ryomen Sukuna from controlling his body.
Because of this, he was sentenced to death by the higher-ups of the Jujutsu Sorcerers.
Ryomen Sukuna was the King of Curses from a thousand years ago, with a cruel, cold, and bloodthirsty personality, particularly enjoying the killing of women and children.
He considered himself the sole exalted one in heaven and on earth.
After he was killed a thousand years ago, his twenty remaining fingers transformed into special-grade Cursed Objects and were sealed. Once the seal was broken, if devoured by a Cursed Spirit, that Cursed Spirit would directly evolve into a terrifying special-grade Cursed Spirit.
If devoured by a human, the King of Curses might revive by gaining body.
However, these twenty fingers, imbued with Ryomen Sukuna's Cursed Energy essence, simply could not be destroyed.
So, when the Jujutsu Sorcerer higher-ups learned that Yuji Itadori could maintain his consciousness after eating Ryomen Sukuna's finger, they decided to execute him, thereby destroying Ryomen Sukuna's fingers along with him.
Ultimately, however, Yuji Itadori was not executed, because the teacher of the Jujutsu Sorcerer who initially saved him, Gojo Satoru, who also claimed to be the strongest Jujutsu Sorcerer, protected him.
Gojo Satoru's reason for convincing the higher-ups was: since Yuji Itadori could remain sane after eating Ryomen Sukuna's finger, why not collect all of Sukuna's fingers, have Yuji Itadori swallow them, and then thoroughly kill Ryomen Sukuna?
After witnessing the cruelty of Cursed Spirits, Yuji Itadori agreed to sacrifice his life to end Ryomen Sukuna, so that Ryomen Sukuna would not harm others.
However, as an observer of memories, Adam felt that the teacher named Gojo Satoru was not truly intending to use Yuji Itadori's body to end Ryomen Sukuna.
Because if he truly intended that, Yuji Itadori should be imprisoned in one place, and Jujutsu Sorcerers should search for Ryomen Sukuna's fingers everywhere for Yuji Itadori to swallow one by one, and then Yuji Itadori should be killed directly.
But Gojo Satoru took Yuji Itadori to Tokyo, transferred him to Tokyo Jujutsu High School to learn Jujutsu, and made him his student.
This was clearly to deceive the higher-ups, intending to train Yuji Itadori into a powerful Jujutsu Sorcerer.
However, even though the higher-ups were wary of Gojo Satoru, they did not want to let him have his way.
Because when Gojo Satoru was on a business trip to other places to eliminate Cursed Spirits, Yuji Itadori and two classmates of the same grade—one was Megumi Fushiguro, the Jujutsu Sorcerer who saved him initially, and the other was Nobara Kugisaki, a frank girl from the countryside—were dispatched to carry out a mission.
The target of the mission turned out to be a special-grade Cursed Spirit.
It was a joke; this was equivalent to sending three elementary school students to confront fully armed, international first-class mercenaries. It was practically a suicide mission.
Adam didn't believe this was an accident; it was absolutely intentional.
To save his two companions, Yuji Itadori released Ryomen Sukuna. After Ryomen Sukuna instantly killed the special-grade Cursed Spirit, extracted the finger from its body, and swallowed it, he directly tore out Yuji Itadori's heart.
Because having no heart had no effect on Ryomen Sukuna as the King of Curses, but for Yuji Itadori as a human, if he dared to reclaim control of his body, it would be equivalent to suicide.
However, to prevent Ryomen Sukuna from destroying the World, Yuji Itadori still chose to reclaim control, ending his own life.
This was why Adam, after reviewing the memories, said that this protagonist template died as soon as he appeared.
"Cursed Energy, a new power system.
Jujutsu, a new Magic system."
For Adam, Yuji Itadori's physique, which surpassed ordinary humans, was of little use, and the bit of Cursed Energy within him, including that so-called King of Curses, he did not even consider significant.
In this new protagonist template, this new World, he was only interested in this new power system and Magic system.
Because after studying these new things, they could all be incorporated into his own system, allowing him to better understand and apply laws, thus increasing his upper limit.
The Marvel Universe has a very high upper limit: Skyfather-level, single-Universe-level, Multiverse-level, mega-Universe-level, and omniversal-level.
If one only developed within Marvel's power system, reaching omniversal-level would be impossible; reaching single-Universe-level would take countless years.
Fortunately, he had his own advantage: he could load protagonist templates and even enter different Worlds to comprehend different World power systems.
Even if the upper limits of some Worlds were not high, they still represented the power laws of a World. As long as he could fully master them and integrate all powers, he could eventually surpass Marvel's power system.
Therefore, even though this jujutsu kaisen World seemed somewhat insignificant to him, he still decided to enter and master all the Magic that could be mastered.
Actually, to say it was insignificant wasn't entirely true; at least he was somewhat interested in the Domain Expansion that Ryomen Sukuna used to kill the special-grade Cursed Spirit.
Special-grade Jujutsu Sorcerers and special-grade Cursed Spirits in this World seem to possess a power called Domain.
According to Megumi Fushiguro's explanation, within one's innate Domain, one's strength would be greatly enhanced, and the Cursed Technique used to activate the Domain would be guaranteed to hit.
There are only three ways to counter a Domain: Cursed Technique clash, escaping the Domain, or using one's own Domain to suppress the opponent's Domain.
If he could combine the Domain with his Cosmo and the spaces generated by his Nine Tomoe Rinne Sharingan, it seemed like there could be some potential.
"First, I'll meet this Ryomen Sukuna."
Adam stroked his chin, closed his eyes, and entered his mental space.
Since he had loaded Yuji Itadori's template, he naturally also transferred Ryomen Sukuna, who already possessed the power of three fingers, from Yuji Itadori's body.
Just as when he loaded the Naruto template, the Kyuubi would be transferred; loading the Harry Potter template would include a soul fragment of Lord Voldemort; loading the Natsu template would bring the Dragon King.
Thinking of this, Adam couldn't help but sigh, wondering why the protagonists in these different Worlds always had some other things within them.