[Rendello]

There are also some 'mobile supermarkets' run to help the elderly in some rural villages, as seen at 11 minutes in here:

https://youtu.be/IiU3Nk16BLQ?t=664

I know my neck of the woods has a not-for-profit called Meals on Wheels that does something similar.

[spike021]

Seen a doc about this before also. Some Japanese towns are super rural and may be many kilometers from typical supermarkets. Many don't even have the famous convenience stores. Trains may only run once an hour as well, if that.

So these mobile supermarkets are as convenient as it gets.