Yes, the japanese version doesn’t have english voices for story mode, that's the way it's always been. But if they were going to leave a language out because of space limit in the NA version, that should be the english audio, since the game already have english text, you know, like XBlaze.
But that’s not the real problem. The problem is that, once again like library mode, Aksys did not informed the fans about this decision. That’s not how you treat you customers.