Not too long ago, I ate ramen from a can on a Tokyo backstreet. It didn’t taste half-bad, but between the barkers for maid cafes and the homeless guy raiding the surrounding vending machines’ recycling bins for cans, it really didn’t make for the most elegant dining ambience.
But the great thing about Japan is the contrasting extremes you can find, and if eating in the middle of Tokyo’s concrete jungle by the soft glow of neon signs isn’t to your liking, you can always come on down to Yokohama, which has a café with plenty of natural sunlight thanks to the restaurant actually being an awesome treehouse.