Here's another vacant storefront in the same plaza as Mushi Mushi. I have found out the the plaza is actually called Garners Ferry Crossing, but have not been able to identify this store through google.
It sits in between Casa Linda and H & R Block, and has apprently been vacant for a good while, although it obviously did have a tenant at one time judging from the evidence of a removed sign above the awnings.
UPDATE 26 Sep 2010: It looks like commenter MB is correct that this place was a Physicians Weight Loss Center, or at least there was one listed at 7546 in the 2009 phonebook and there's not one now. I'm thus changing the post title from the generic Storefront to that. (And, no, they apparently don't use an apostrophe in their name for some reason).