Miruna

After a space-time anomaly and due to an involuntary fusion of universes, the world of Jujutsu Kaisen and the world of My Hero Academia merged. This didn't cause too many problems; however, in an unknown manner, the King of Curses, Ryomen Sukuna, managed to escape from his vessel, Yuji Itadori, and wandered across all of Japan. Consequently, professional heroes and first-grade and special-grade sorcerers were immediately summoned to hunt him down, though without any success.

Three days after Ryomen Sukuna's escape, the heroine Rumi Usagiyama—better known as Mirko—found him, but the King of Curses wasted no time in turning Mirko into his new vessel, thus causing Rumi Usagiyama to become the new Ryomen Sukuna. All professional heroes and high-grade sorcerers were summoned once again to stop her this time, but thanks to her 'Rabbit' Quirk and her cursed technique, she managed to escape.