The guidelines and application forms for the current call for applications are available on the website of the Graduate School of Science of Osaka University: http://www.sci.osaka-u.ac.jp/en/admissions/graduate-admissions/
If you want to apply, keep in mind that the first thing applicants must do is selecting the research group(s) they want to work in and contact the professor(s) of the group(s) in order to obtain a "Letter of Conditional Acceptance". The first contact should happen as soon as possible and at the latest four weeks before the application deadline. The list of groups is found here
Please contact us if you have any question or need help in contacting the professors.
Information about further calls for applications
Note that the application schedule, guidelines and deadlines change
every year, but usually we have two calls for applications for the
Master's and Ph.D. programs, with deadlines at the end of November (for
enrollment in April or October of the following year) and at the end of
June (for enrollment in October of the same year). The official
guidelines are usually published in April and September on the website
of the Graduate School of Science of Osaka University: http://www.sci.osaka-u.ac.jp/en/admissions/graduate-admissions/
Note that only the official guidelines contain reliable information and
the dates mentioned on this webpage are only approximate and subject to change.