300 hundred years after the harmony ritual (a ritual where all cursed energy of the planet is erased for aliens and humans to live together peacefully), a girl is just walking around her school (it's a normal high school) , when she finds a weird box. When she opens it, she finds a weird looking finger. She doesn't know it yet, but it belongs to Itadori Yuji, who turned himself into cursed objects by splitting his souls into 10 fingers positioned around japan , so if cursed spirits ever showed up again , someone could consume the finger and use his cursed energy.