@mari30, in my country the deadline is 12th September, 15th of August is the deadline for the Certificate of Health.
I have another question concerning the choice of universities. As suggested, I am now contacting professors and two of them already answered, however one of them told me that even though he would be available to be my advisor, he still does not recommend me to enroll in his university if I am planning on keep studying there after my research. That is because he belongs to Education Faculty 教育学部 and it would be better for me to do a master/doctoral course at a Letters Faculty. Indeed, my research is more about literature but I do not know why almost every professors specialized in my research topic belongs to Faculty of Education which does not make sense. Does it mean that I cannot keep on studying there after the research? There are some courses like Japanese literature and history but not much else... I guess I am required to study the same subject of my research, right?
Another question: if my advisor belongs to, let's say, Education Faculty but in the University there is also Faculty of Letters, after my research can I keep studying enrolling as a literature student?