There are a number of conditions on your international student visa tied to your academic choices and progression.
The differences between full-time and part-time study, distance learning/online learning and Summer Term.
There are implications of not maintaining a full-time study load.
How changes to your enrolment such as program leave, or early/late completion, impact your student visa.
What happens if you are given course credit or advance standing for previous study.
Completing your program (degree) within the time specified on your visa and confirmation of enrolment.
If you need to apply for a new Confirmation of Enrolment, here you will find links that will assist you to understand what is required
What happens if you transfer to another program within Gifu-city.