Where do people go for grocery shopping?

I sometimes get this question from my guests because you don't see any grocery store or supermarket when explore Tokyo. This is just because where tourist explore is not a residential area. Shinjuku and Shibuya are very busy shopping area, Imperial palace is right next to Nihonbashi financial district and Marunouchi business district, Tsukiji fish market is sitting next to Ginza district which is also shopping area, and not many people live IN the area, but AROUND. When tourist visit those places, they just take metro and pass residential area in between where you can find grocery stores on trains. Asakusa area though is a nice combination of commercial area and residential area. It's a very touristy place with Kaminarimon gate and Sensoji temple but it's not strictly touristy. People still have their life there. You can find a grocery store right across the street in front of Kaminarimon gate and there is a supermarket in the middle of the chessboard like shopping area near Sensoji temple. So there ARE grocery stores and supermarkets in Tokyo but you just don't see them !
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