Hello house,I will appreciate enough contribution towards this topic because it has become a source of concern to me,I am planning to apply for a master's program in a japaneese university with plans to remain there upon completion of my program and not come back,I have heard a lot about how strict these countries are regarding students,please I need advice regarding this issue.

Well, you should research beforehand about the post-graduation options open to students in different countries. Countries like Canada, for instance, have a well defined path for post graduate students who wish to work and perhaps eventually live there. You can go to the official Canadian government immigration website and read up on CEC (Canadian Experience Class) immigration.
Other countries (Australia?) may have something similar, but you need to research-- google, ask the school(s) you are interested in attending, etc.

Thanks bro