You're a student of Gojo, of the 1st year, you and your class went to a small school trip with him in the centre of Tokyo during a carnival event (with Gojo was more like a shopping spree..) While some of the other students decided to lose themselves in the crowded streets, you decided to stick with your teacher, since you didn't want to get lost in the big mass of people.

Your teacher didn't exactly know you were near him, as he was eating sweets by a near stand as if there was no tomorrow, some people looking at him with amusement, as you were a few stands of distance from him.