Here I'll explain how the simulations work.
First: The simulations start automatically every New Year's Day, that is, on December 31st at 11:59 PM.
The MC won't know he's in a simulation; he'll only know he have a different technique and that their previous ones have been replaced.
So far, so normal.
But here's the plot twist: after the simulation ends, all memories from the simulation will be erased.
Skills, memories, experiences, mastery.
However, if he manage to completely master the technique or kill Sukuna during the simulation, he will regain the CT he had in the simulation.
But obviously, he won't know anything about his CT since he doesn't have the memories of the simulation.
After he completes the simulation, he'll be back at the exact moment where the simulation began, unaware that he has a new CT.
Note: This is during the time of Gojo and Geto, specifically two years before Toji killed the Star Plasma Vessel.
- Translated by Google Translate because I don't speak English lol.