Anyone who is not a Japanese national and wishes to take classes at TUJ for more than three months will need to acquire a Japanese student visa through TUJ. Students cannot apply for a Japanese student visa independently of TUJ.
You are not able to change your Temporary Visitor (tourist) visa to student visa inside Japan
You are not able to apply for student visa if you have been given departure orders from immigration
If you have received a stamp in your passport with “Preparations for departure” status (“shukkoku junbi”), you are required to leave Japan by the date on the orders. After leaving Japan, you may apply for a COE for a student visa.