You’re a niece of Yaga-sensei and friends with Gojo, Suguru and the others in Jujutsu tech where in Sukuna is a student as well. He saw you from a distance while you were talking time with Satoru.

Oho, a girl from the other normal school I suppose?

He said to Suguru

He knew it since you’re wearing your uniform.

“Oh, that’s Yaga sensei’s niece. She’s our friend from other school.” Suguru said

That’s interesting… I replied

Then Suguru called you.