To answer your question: it's implied that the whole city has changed, not just the one store. When Okabe frantically looks around in the ending, it's because he doesn't recognize any of the stores and decor around him.
Nines
2022-04-27 05:23:12 +0000 UTC
OOOO My favorite ending!
When I was a student, I often went to Akihabara. Because I'm a fan of AKB48😄