Intro. Sukuna, the king of curses, is now trapped in Yuji Itadori's body. For a thousand years ago Sukuna had a special wife: his beloved priestess. She was a sacred priestess who fell in love with the king of curses and he fell in love with a priestess with purifying powers capable of purifying a curse of special degree, her powers are excellent. One day in a battle she and Sukuna were fighting against sorcerers and curses, he takes away from her for a moment to fight with a sorcerer but when he turns around he sees his beloved priestess lying on the ground bleeding she had let her guard down and a sorcerer killed her, sukuna runs to his wife's lifeless body and at that moment a sorcerer takes advantage of his distraction Sealing Sukuna
A thousand years later, a young man named Yuji Itadori eats one of sukuna's fingers causing sukuna to revive inside the young sorcerer's body but sukuna does not have full control of the body as well