Students who satisfy all of the requirements below must submit either the Application for Extension of Enrollment Period or Report of Withdrawal from the Doctoral Program (after the completion of required course work without submission of a dissertation).
• Enrolled for six semesters or more after admission.*1
• Satisfied the requirements as a doctoral candidate （Please refer "Guidebook").
• Earned four or more credits from Independent Research (特別研究) (only for those who enrolled in or after Academic Year 2007).

The student may enroll for a maximum of 12 semesters by applying for the Extension of Enrollment Period.*3
Application is required each semester.
If application for the Extension of Enrollment Period is not completed by the specified date, it will be treated as withdrawal from the Doctoral Program.

*1 Excludes any periods of Temporary Leave of Absence.
*2 Upon satisfying the requirements for program completion (excluding the enrollment period), those judged as outstanding in research achievement by the Graduate School Committee may complete the program by enrolling for two or more semesters (Graduate School Regulations Article No. 109).
*3 Excludes any periods of Temporary Leave of Absence up to the Extension of the Enrollment Period.