I visited Japan for a month and this store reminds me so much of a true Japanese grocery store that nostalgia hits me every time I enter.
Unlike most Asian grocery stores (I'm looking at you, Strip District) Tokyo is VERY clean and has really fresh produce and meat. Every time I walk into Lotus Foods in the Strip I'm hit with a certain smell and it's always so dusty. It's awesome to be able to go to a grocery store that's small enough to keep their stock fresh. I also really appreciate how dedicated they are in keeping their store as Japanese as possible.
They stock the staples in Japanese beverages and snack foods as well. It's so hard to find Pocari Sweat and other soft drinks in Pittsburgh that you'd find in any vending machine in Japan but Tokyo stocks it in a variety of bottles; chilled or room temp. I always buy a big bottle of Pocari Sweat when I visit to put in the fridge. If you've never had it, it's a sports drink that has a hint of grapefruit. The grapefruit is so subtle that there is almost no aftertaste. It's almost like water but not sickeningly sweet like flavored water in the US.
They also have prepared foods available by an in-house chef. They come in the form of bento boxed lunches that have sushi and tempura and, while I haven't had one yet (some day I'll remember to go before I eat), they look delicious and fresh and are packaged in an appetizing way.
If you're Japanese and have never heard of this place you should definitely check it out. It's an incredibly authentic grocery store and just as clean as one found in Japan. If you're an American and are a bit jaded about Asian grocery stores because of the dirtiness and grumpiness found in many of the ones in Pittsburgh definitely check Tokyo out, it's incredible.
UPDATE: It took me until just a few weeks ago to try out their bento lunches. They're healthy and delicious. They'll heat the bento up for you on premises if you're eating on the go. The owner of Tokyo has also recently started selling his bentos and sushi in Lotus Foods in the Strip. Give them a try for a quick, healthy lunch.