I am going to tell you about the things that you do daily.
First The Center for International Education (CIE).
This is where you practically live.
You have your classes here, this is a speaking classroom.
You wait in the CIE student lounge between classes.
You pick up your school mail here.
When you are not at the CIE you are probably eating.
The Post Office Bank can be used if you have a checking account with a 4 digit pin number and a cirrus of plus on your bank card. The post office bank is every where in Japan, so it is very handy.