Most of the folks in black suits in this photo are a years away from graduating. Its recruitment season in Japan where university students go out looking for jobs. A few interesting facts:-
-Most students look for a job a year before graduating.
-Students who are interviewing or joining a company on the first day have to wear something called
Recruit Suits - usually a black suit and at this time of year you will often see hoards of students
like this (
photo source).
-Because there are so many students applying to get into any one company, entrance examinations are usually held where the main purpose is to filter the numbers down.