artoo,
Your best bet is to ask someone who reads Japanese and English to assist you in changing the system language to English. Once you get to the proper menu (which I hope the translator can help you with), the menu choices should confirm whether it can be done.
Once you can read the menus, the changes is probably made much as described in the U.S. version - I hope. I have absolutely
no experience with the Japanese specification units. However, if the same as U.S. COMANDs, language settings and time settings are made in the Systems Settings menu. That is accessed by selecting the "SVC" button, then scrolling to the "System Settings" menu. Once there, scroll to language or date/time. Unfortunately, I do not see a "SVC" button in the photo you supplied, and some of the labels on the buttons are either in Japanese, or i cannot make them out. if you have the Japanese COMAND manual, perhaps the translator can assist you in accessing the System menu.
If it is of any use to you, the COMAND manual for the U.S, version of your COMAND is at
http://phdwebsite.powerpulse.cc/COMA...L%20COMAND.pdf - but I don't know how much of it will be the same. We'd appreciate some feedback from you on this.
Also - and I don't know if it is true for your car - the language for the instrument cluster display in my U.S. spec '05 is independent of the COMAND display. It is set in the instrument cluster in the "instrument cluster" menu. This may not be true for all cars. The choices in my U.S. spec car are all European languages.