How to Leave Japan
Most students go to Japanese language school for 15 months ( 12 months of school & 3 months of vacation). At the end of the 15 months you need to leave Japan, or apply for a new visa. The school will help you get a new visa. Do not leave Japan without completing these tasks, and submitting these documents:
Notify the School your plans to leave Japan.
Pay all outstanding bills, rent, or utilities.
Close your JP Bank account.
Submit a Notification of Moving Out (Tenshutsu Todoke) at city hall.
Return both health insurance cards (green and pink) to the city hall.
Give your residence card to the immigration officer at the airport.