Wow! when I got back from Japan I saw a store in torrance near my apt that looked a hell of a lot like one I saw in Harajuku. I never bothered to check it out, but damn I moved to westwood recently near UCLA and I saw the same store. Turns out it's the company that owns family mart trying to open up Japanese style Convini's in the US. I decided to check out the one in westwood and it's not too shabby. It has some american fusion in there, but hasn't totally left out the Japanese element. You can get riceballs, melon bread, Curry Pan, Buns and the such. Sure beats 7-11 =). Too bad the one in Westwood might close down because of bad location placement. They should have placed it in westwood village where they get more Student foot traffic.
http://www.famima-usa.com/