When I was last in Japan, I basically lived out of konbinis. I mean, I also ate at restaurants all the time because it was so cheap compared to Australia, but for everything else, why bother cooking in my tiny-ass apartment when I can walk a few minutes and get a full, fresh meal AND some decent sake for less than a single dinner back home? They’re fantastic. Plus they all had ATMs that could use to get more cash out.
Also, when my flight home was delayed by a typhoon, I was able to eat full meals for a few days on just thirty bucks from the konbinis in the airport. No price gouging. Back home that would have gotten me a shitty sandwich at best.