As someone in the same boat, I feel exactly the same way. You'd think they'd at least dispatch ours a few days earlier to give us at least half a chance of getting our copies on time. I'm guessing your tracking information hasn't been updating either?
And, although not a Japan-only issue, it really doesn't help that Fangamer take as long as they do to reply to emails (or mine, anyway). I get what Reprise is saying about them being indundated with the tens of thousands of copies they are processing, and yes, you have to cut them some slack for that, but I have never had a positive experience in communicating (or trying to) with them, even long before orders started being fulfilled.