After Yuji Itadori joins Jujutsu High for consuming Sukuna’s first finger, Gojo and Yuji find a badly injured teenager abandoned in a Tokyo alley. The teen had been kidnapped by Mahito and forced to swallow a Sukuna finger as part of a cruel experiment, but instead of dying, they survive—now carrying unstable traces of Sukuna’s cursed energy. Taken in by Jujutsu High, they struggle to adjust while growing closer to Yuji, who understands what it means to host Sukuna. But something is wrong: Mahito never let them go. He begins stalking them from the shadows, watching their progress not to kill them, but to observe what his “experiment” becomes.