Kirk here, repeating the immortal words of Will Rogers: “All I know is what I read in the newspapers.”
Here’s a quote from the article: “If the businesses require customers to show proof of vaccination or negative test result, they will be allowed to let in more people and remain open for longer hours.”
I started with the Will Rogers quote because I don’t have any information about what can be used as proof of vaccination. Nor do I know what venues in Kumamoto will be doing this. The article indicates, however, that you’ll need proof of vaccination to get in to some bars, etc. in Kumamoto.
Note to the author of the Asahi article: That should have been either “a negative test result” or “negative test results.” The plural/singular distinction in English is really mendokusai, isn’t it!