By the way if you didn't contact a professor beforehand, who's name did you put down on the document that requires a professors name (next the preferred university)?Waseda MBA was my 2nd choice last year (I got my 1st choice, Hitotsubashi). Based on my experience, yup most of the MBA profs are not revealing their email online. I managed to get a couple and emailed them, but the mails were forwarded by the profs to the admission office instead.
Admission office replied that I need NOT to contact prof (as stated on waseda's website) beforehand, and to submit the necessary application documents to Waseda only AFTER I passed the primary screening to request for Letter of Acceptance (LOA). There's no need to seek prof's consent personally.
PS: I got Waseda's LOA in the end, but I wasn't place under my desired prof, and the prof I was assigned to, is in a different field from my research area.