Wait, where did Laura go? Souji appears to have something that in a dog would probably be referred to as herding instincts, in that he usually tries to make sure people stay together within the group, and if anyone strays he feels compelled to go looking - nevermind that he himself has a tendency to run off on his own at times.

At least there is no sign that she would have left the store, and after some maneuvering around, he realizes that the only place she could be where she wouldn't be seen is in the changing rooms. So naturally, that's where he heads.

"There you are." And no one has apparently taught him in nineteen years that it's kind of impolite to stand on his tiptoes and look over the door to the changing room when someone is changing on the other side.