Nakamura Sachiko was a lucky, blessed girl all her life. No, that is an absolute lie. Unlike how her name suggests, she was extremely unlucky. If she play lots where the probability of getting a prize is 99%, she will get a Thank You note instead of a prize. That is just how unlucky she was.
Throughout her life, there were many bad things happened to her and most of them were because of her bad luck. Her family died in a car crash when she was seven, during a road trip she begged her parents to take her and she was the only survivor of the said accident, leaving her completely alone. She was put in an orphanage but every kid there treated her like a cursed. They said how could someone be this unlucky unless they are cursed?
At some point, she started to believe it herself. She was unlucky and maybe cursed. Maybe she won't even live to old age because her luck probably would find a way to kill her before she even hit 30 or something.
And, she did. When she was nineteen, she just had to die in a way which only the most unfortunate people died. She twisted her ankle and fell from the stairs which were only a few feet above the ground. Normally, she would've just groaned and get up. But, someone just had to leave their skateboard to where she would've fall and her neck just had to twist when her head lands onto the skateboard. To make things worse, there were no one else at the scene when the accident happened.
Sachiko inwardly screamed and cursed at the gods for her pitiful death. Surely, she knew she probably won't live to old age but how can she be so unlucky to die like this?
"So, your death seems like an accident." The god states.
"You mean my whole life is an accident? Coz that's what I've been feeling like."
As Sachiko's attention was brought back to where she was right now, sitting in a chair waiting for some answers, she couldn't help but sarcastically said.
"Definitely, not an accident." The self-proclaimed god replied.
"Yeah, right..Anyway, what do you mean by my death seems like an accident?" Sachiko asked.
"Well, exactly what it means. We've actually made a mistake and thought you were the one who was supposed to die that day." The self-proclaimed god replied rather awkwardly.
"You can't be serious?"
"I'm serious. Really sorry for what happened. It's the first time we actually took the wrong person like this.." He tried to explain.
"what should I do then? After you've killed me like that..., now you're saying it was a mistake! WHAT I'M SUPPOSED TO DO?!!" Sachiko sobbed, becoming too emotional at the reveal. Right now, she was trying to be tough and sarcastic but how could she not break down after learning that her rotten luck actually killed her and took away everything in her life?
Seeing this, the god thought for a moment before he finally said, "Okay. There's a solution. We can make you reborn in a different world and even give you three wishes as a gift."
"...Reborn?"
"Yes. You'll be reborn in Jujutsu kaisen world. What will you wish for your three wishes?"
"Okay. Let me think.." Sachiko said after a while, "I want an innate ability called Possibility which will allow me to see probability of events and possibilities and manipulate the probabilities."
"Granted. However, seeing possibilities itself will have some limitations.But, to compensate for that, some special abilities could be gained in the future."
"Alright. My second wish is I want to have infinite amount of cursed energy. It would be nice if I don't run out of cursed energy at all."
"Granted."
"For the third wish, I want three more wishes." Sachiko smirked at that.
"...You can't wish for more wishes." The god said as he rubbed his temples.
"But you didn't say I can't." She said with a smile.
"...Alright. You're sneaky. I'll give you that." The god sighed, then, said in an annoyed tone, "But you can't wish for more wishes."
"Fine, I want to be able to control the cursed energy itself, including my own and others'."
"Granted but it will be hard to master."
"That's good enough!"
He nodded and just before he sent her to Jujutsu kaisen, he said, "I'll erase your memories of future events in Jujutsu kaisen before you go. But, you'll remember the information about curses and Jujutsu."
"Why?"
"because that will make things more intersting." He replied and then touched her head. Sachiko felt so sleepy suddenly and her world turned black soon after.
"And...let the show begins!" The self-proclaimed god said with a chuckle.