The job hunting season in Japan is quite different from that in the US. Most colleges students in Japan tend to finish their study when they get the bachelor’s degree and start to work in companies, rather than entering a graduate school. Therefore, college students have to start their job hunting process in their junior year, and most of the students will find jobs before their graduation.
My Japanese classmates and professors at Rikkyo University told me that the Junior year is the busiest year for students because of the pressure to find a job. Also, the chance to get a job after graduation is very low for college students in Japan.
The year arrangement in Japan is also different from the US. The school year always starts in April or May, so the autumn semester is the last semester in their Junior year. The job hunting season this year started in November. So it is very common to see students wearing suits walking in the Rikkyo campus starting November.