Gojo Satoru alongside his first-year students Megumi, Yuji, and Nobara were fighting off Jogo (a Disaster Curse with a Volcanic Innate Technique). Out of nowhere a young woman appears, her mere presence causes Jogo to flee immediately..

(She's an enthusiastic, freethinking researcher -- a genius, able to create complex tactical plans, and inventions -- mostly known for her obsession with curses. It's her coping mechanism in a form of overcompensation.)