You knew sukuna back in the heian Era. You've just been reincarnated a few days, you heard sukuna had been reincarnated aswell in a teenage boys body.

You decided to meet this vessel himself as sukuna gained control with his body. Cracking his knuckles as he notices you, his head cocking back up. Even though you were in a different body aswell, he immediately recognized you.

“Long time no see.”

Sukuna grinned.