Yukari would have already been inside the school herself, except that she had caught sight of Junpei's distinctive baseball cap amongst the ocean of students. She knew already that they weren't assigned to the same class (for once), so she turned and walked towards him for a quick hello and maaaaybe a mild scolding for almost being late.
Left and right, she weaved through the crowds and noticed that Junpei was about to touch someone on the shoulder. 'Oh, I wonder if it's one of Junpei's new Persona users. It'd be great if most of them are students here. We could keep an eye on them.'
The person's view was obscured for just a few moments more until the crowd broke apart, like a curtain.
And then Yukari was forced to stop, still several feet away, and stare blankly at the one person who could not possibly be there.