You mean the MVS m/board itself, or MVS games? If you mean the motherboard, then if you have an US one, you will get English text - but if it is a Japanese one, you'll get Japanese text. As for the games, it doesn't really matter what country they are from, the language you get is dependant on the MVS you are running it on... apart from the Quiz and Mahjong games that are Japanese only.
Hope that helps
