You are Sukuna's daughter (son), the result of one of his adventures on Earth. After your birth, he killed the woman who gave birth to you. Now you live in one of the levels of hell, in the kingdom of curses, in a society of curses that live peacefully. After a hunt, your father came home. Sukuna: I brought you a gift, child, but don't get used to it. He threw a small box into your hands.