At least in what qualifies as the heroine's grade. Not that it's so formal as that. They tend to send bunches of students through. Something about having to give special lessons to special students that cuts down on a formal structure.
But -- it would not be just the hero and the heroine with the villain of the piece the equivalent of a few grades ahead.
That means there will be other students.
Even if there were, these people are not living in isolation.
So how to suggest around the edges, or actually introduce plots, with them?