Please look into my history post,
here
actually, the info is all on the previous pages. i would dearly appreciate if you check through those pages before posting any questions.
Some universities (like tokyo uni, soka and so on), i believe, do have japanese languages. however, on a university level, they teach intensive advanced japanese. So if you do not know Japanese at all, you can't really enrol into the universities. Most universities will take in JLPT 2 students and you can't just be anyone to enrol into the university. My friend who enrolled into Waseda, needs a "Letter of Recommendation" when applying for a place in that school. on top of that, there are a lot of other things to prepare...
If you know nothing, then you can study in their preparation school. which the school will focus you on Japanese, and at the same time, prepare you for the Entrance Exam for foreign students. if you take the intensive course, you will be able to achieve the JLPT 1 level in a year, and apply for university education in the major universities using the results of your Entrance Exam. and depending on the university, you might need to go their own entrance exam or interview before they consider whether to accpet you or not.