After Returning, I Became the Jujutsu World’s Only Rule

When Itadori returned to 68 years in the past through Maru’s Cursed Technique, [Chaos and Harmony], he had already become [the Strongest]. Now he could change every misfortune that had come before!

But… after doing it all over again, the timeline seemed a little off. Many [variables] that hadn’t existed before had appeared. “I will eliminate the [variables]. That is my [responsibility].” So said the hooded man, staring at the missing little fingers on his left hand and right hand.

This isn’t a mindless power fantasy. Itadori at 68 is here as a safety net and an overwhelming force, but he won’t steamroll everything from start to finish. Most of the story follows the original plot, with some original characters added to keep things plausible.