Earlier quoted context omitted.
I lived in rural Japan last year, and had similar experiences with stores being open or lack thereof. There were three restaurants and two bars. One restaurant never opened for dinner, another was run by a family, was closed at 8PM and was closed on Sundays, the third was run by one woman and was closed for dinner on weekends and also tuesdays. One of the bars' closing schedule involved being closed on the third Sund…
That's how it is in rural America (Midwest, the South) also. You need a large population to support 24 hour consumerism.
Since gas stations have permission to stay open around the clock they're used to get emergency food. You can also get food delivered on Sundays and in the middle of the night, so it's not so bad.