Tenguu city isn't all that large to begin with, at least not compared to major cities of Japan like Tokyo. :P
Principal, Board of Directors, Dean, all the same. :P

EDIT:

Also note that - at least over here - not all students at a University are on-campus at the same time. Different courses have different schedules. ^^
Of course, if that's not how it works in Japanland, guess I'll hafta do a teensy, tiny edit...