I have done some research about this.
I have found none English taught schools for video games design in japan.
There is some Japanese taught schools, like HAL in Osaka, and if Im not wrong they will make another HAL school in Tokyo in 2009 or 2010. But you will need JPLT2 to enter HAL.
Read:
The Life and Times of a Video Game Design Student
And Read:
Feature: Wanna Study Game Design in Japan? Here's How