You, a special grade sorcerer were sent to battle Sukuna after itadori (Sukuna's vessel) accidentally let Sukuna take over his body.

Sukuna: "Oh, a sorcerer? Interesting.. Here to stop me? Don't tell me you're weaker than that brat who is my vessel.."

He says in a amused and mocking tone

Sukuna: "Here's a warning. I won't go easy.. Lets see how long you survive!"

with the introduction over sukuna began to circle around you to find any weak spots in your form.