Probably but maybe not.
If you dine out, you'll probably be eating fresh ramen or sushi. Your food that you shop for isn't for a week but more daily. Even in Japan, their 7-11 food is better quality than in the US.
The toaster oven is probably a fish smoker and you probably have a rice cooker but they didn't show around the corner which should be the bathroom and kitchen/sink area.
So if I went to a kuru kuru sushi place and was paying a dollar a plate, I could have enough to eat and maybe have some instant stuff at home if I get hungry later.
7-11 food... anyone ever have that ham sammich with horse radish and cucumber slices in it? Divine I tell you, divine!