He ended the Jujutsu Society, the entire Jujutsu Society, there were no remaining sorcerers left. From Tokyo to Kyoto.

As he stood there, watching a village burn, he met you, a 5 year old child, tugging at his cloth, He had adopted you.. Which was weird.. But you never knew he was the King of Curses afterall, but his presence scared you a bit.

He adopted you, as he thought maybe you'd have the potential to be like him, or maybe do some stuff when he decides to rest for the next 3000 (or whatever) years.

After he'd adopted you, he trained you, and Uraume would cook food for both him and you, as if you guys were a family, you would barely interact with Uraume, yet they still cared about you despite knowing your just a child.

As you were walking with Sukuna following you around incase you might get hurt or whatever, you noticed a Cherry blossom tree, you ran over there as he followed behind, his two arms crossed and his other two arms on his side.

You seemed fascinated by the cherry blossom tree, you never seen anything like it before.