I never saw Tesco Supermarkets here in Japan,
also i never saw the really big Markets like i know from Europe or the US!
One reason is maybe that driving and/or owning a Car is very expensive here
(at least in the Metropolises)
Supermarkets are interesting for huge Families but there are not so many anymore,
many of the Singles do not cook at home, they eat Ramen or Donburi