The Kid I Used to Know

After the events in Shibuya, Itadori Yuji is ready to give up. His hands have been painted in blood thanks to Sukuna, his friends are scattered or dead, his mentor sealed away in the prison realm, and now he's faced with a reality where humanity is being forced to evolve or die. He doesn't trust himself, and he sure as hell doesn't trust the curse inhabiting his body. Figuring the best thing he can do for everyone is to stay out of the way, Yuji resigns himself to staying away from everyone, content to simply wander the Shibuya area exorcising curses with his half-curse brother, Choso.
The jujutsu world has other ideas for him though. After his classmates find him and convince him to join in on their plans to save the world, Yuji's just glad to be useful. Of course, these plans quickly fall apart when Yuji and Megumi fall through a wormhole in time, leaving them on the front step of a teenage Gojo Satoru and stuck in the past.

Getting back to their future isn't as easy as falling into the past though, and Yuji and Megumi aren't even sure it's possible.

So do they continue looking for a way back to their friends, or do they stay in the past and try to prevent the tragedies of the future from ever happening?