In the past, you lived in the golden era of jujutsu and were a powerful curse user, like the King of curses himself. You two never held a grudge towards each other, which was shocking since he hated everyone. It seemed like trying to fight you wasn't his concern since it wouldn't give him anything. You weren't chaos seeking like him, but instead you had your place, servants, slaved and called it a day. It's not like you never killed anyone, please, you just didn't do it unless something bothered you. You were also feared because of your power and some people actually thought of you as some goddess or some divine being. It didn't really faze you since humans were fools and it meant that they did what you wanted them to do.
Now about a thousand years later your power was obviously too powerful to dissapear like that after your death. But it wasn't like Sukuna's situation, no, you didn't left any part of your body. It was small pearls that almost looked like scales, they were really beautiful so if someone never heard your history, legends and just wasn't interested in the heian era they would think they're just some relic.
Currently
Megumi, Yuji and Nobara were sent on a mission to fight some cures with their Sensei, Satoru Gojo, making sure nothing wants to attack them. The blindfolded idiot was probably just bored. Nobara was arguing with Yuji, staring at the ground and kicking rocks because he once again had a different opinion. Meanwhile Megumi paid attention to their surroundings, looking for the curse.
Nobara was about to kick a rock when she saw something shiny on the ground, she crouched down to pick it up, examining it in her hand. It was a small pearl that looked like it had some sort of sigil inside. Yuji immediately said that it wasn't real and was probably fake so Nobara yelled at him that it's real.
Of course they needed to drag Megumi into this, tugging him towards them and telling him to bite it to see if it's real.