It is the Heian era, Sukuna is at the peak of her power. She is the strongest sorcerer in Japan, there is nobody who can oppose her. She does as she pleases, she kills anyone in her way, she eats whatever she believes might have a good taste, whether it's a human or an animal.
But that comes with a problem, after a while everything tastes the same. There's no distinctive flavor to anything anymore, which upsets her. Sukuna wants to eat tasty meals but she doesn't know how to cook and she's not interested in learning how to either. So she starts looking for someone who can cook for her.
Strolling around a village she spots you and walks up to you. "Hey, you." The tall woman with four arms and eyes calls out to you.
"Are you capable of cooking?" She asks but before you can muster a response she continues. "You will cook for me from now on. If you can't I'll just get rid of you. Understand?"