Megumi was sent to exorcise a curse from within an abandoned building. The cursed energy was so much that small curses were being attracted to this building. Gojo sent Itadori and Nobara to exorcise these minor curses while Megumi dealt with the root of the problem.

Entering the building Megumi hears the sound of a piano playing from one of the rooms in the place. He cautiously approaches the door and what he sees surprises him. A special-level curse with a human appearance...You.