So we went and wow, what a difference from American 7/11's, they actually had fresh fruit and vegetables and the boxed sushi rivals what we can get at our nearby sushi restaurant back home. The rice balls are packaged so the Nori is encased in plastic and stays crispy until you open the package... and the Oden by the register looks unappetizing but is actually quite good. And all very reasonably priced.... and the 7/11's had no problem with our American credit card, unlike many small restaurants that only accept cash... fortunately, the 7/11 also has an ATM that works with most major networks. (some of these no-credit-card restaurants will accept a prepaid stored value card like Passmo or Suica)
We took the food back to the hotel and realized that we forgot to pick up drinks, fortunately, the hotel had a handy beer vending machine on every floor... mmmm...Suntory Premium Malt... even the canned highballs (whiskey+club soda) are good.
We had to cancel our trip to Japan in 2020 due to COVID, and looks like 2021 is out too, hopefully we can return in 2022.