Jujutsu Kaisen has long hidden Yuji's origins. He has always been special, with incredible physical strength and the ability to suppress the Curse King. In chapter 143, the story reveals that Yuji's parents are Jin Itadori and Kaori Itadori.
Kaori has a scar on her forehead, meaning she has been possessed by Kenjaku. However, that still doesn't solve the mystery behind Yuji's birth.
While Yuji is the main protagonist of the series, Sukuna is the main antagonist. However, these two people have many similarities. Furthermore, countless Jujutsu Kaisen theories have suggested a connection between Yuji and Sukuna, but chapter 257 finally revealed it.
How are Sukuna and Yuji related in Jujutsu Kaisen?
According to the spoiler, Yuji's father, Jin Itadori, is the reincarnation of Sukuna's twin brother, making Yuji Sukuna's nephew.
When Sukuna was still in his mother's womb, he took the life of his twin brother so as not to starve to death. This explains his unusual appearance. Gege drew inspiration from ancient Japanese mythology for “Ryomen Sukuna,” who has two pairs of arms and two pairs of legs, one pair each in the front and back of his body.
The word “Ryomen” also means two-faced. Even in Japanese legend, Sukuna is also a conjoined twin. Jujutsu Kaisen chapter 257 begins with a short flashback where Uraume asks Sukuna about Yuji. Uraume notices some similarities between Yuji and Sukuna.
Sukuna reveals that Jin Itadori is the reincarnation of his twin brother. Kenjaku gave birth to Yuji after possessing Kaori Itadori for an elaborate plan, even sealing one of Sukuna's fingers inside Yuji.
Although there have been countless theories that Sukuna and Yuji are twins, the truth is not what fans imagine. On the other hand, the theory about Sukuna harming his twin brother, originating from an ancient Japanese legend, turned out to be true.
The intriguing part, however, is that Gege chose this particular fight to reveal Yuji's origin to explain how they both have the same technique beyond being a vessel or whatever. Sukuna and Yuji are of the same bloodline and both can use the technique “Mizushi”.
Even so, there are slight differences in how the two use Mizushi, considering the era and the spellcaster using it.
It is unclear at what point in Jujutsu Kaisen Sukuna learned about his connection to Yuji. After all, when the Curse King initially tried to possess Yuji, he was surprised that someone could suppress him. When he was first reborn, the Curse King even asked who Itadori was?
https://gamek.vn/jujutsu-kaisen-chuong-257-tiet-lo-moi-lien-he-giua-yuji-va-sukuna-178240419161750113.chn