I don't like the original poster's comments and the wording "rejects" - University of Tokyo is one of the tops and you can either be able to enter or not enter at all. There's no "rejects". :frown:
Anyway, the main campus in Hongou has a very long history and as the university grows, it simply cannot accomodate all the fuculties, graduates schools and institites. That's the reason they have sevearl campus (not only Hongou and Komaba).
When you enter a Japanese university, the first two years are to be spent at kyouyou-akubu ("the Faculty of Arts" is the translation I found on the net but am not sure if it is correct), and from the 3rd year you are starting more specific study at the faculty.
Most faculties and graduates schools are in Hongou campus, and the Faculty of Arts is in Komaba.
(Note: There are three campuses within Hongou Campus.)
Hongou Campus (Hongou Campus)
[F] Law, Medicine, Engineering, Letters, Science, Economics, Education, Pharmaceutical Sciences
[G] Humanities and Sociology, Education, Law and Politics, Economics, Science, Engineering , Medicine, Pharmaceutical Sciences, Information Science and Technology, Interdisciplinary Information Studies, Public Policy
Yayoi Campus (Hongou)
[F] Agriculture
[G] Agricultural and Life Sciences
Asano Campus (Hongou)
[F] Science, Engineering
[G] Science, Engineering
Komaba Campus
[F]the Faculty of Arts, Mathematical Sciences
[G] Arts and Sciences, Science
Kashiwa Campus
[F] some labs from Science, Engineering
[G] Frontier Sciences
There are also
Shirogane Campus and
Nakano Campus, but there are no faculties nor grad school, just a few institutes belonging to University of Tokyo
東京大学 - Wikipedia
University of Tokyo - Wikipedia