Japan tightens rules on COVID test certificates for travelers
https://japantoday.com/category/national/Japan-tightens-rules-on-COVID-test-certificates-for-travelers
That headline is a misnomer. The article itself doesn’t say the rules for the certificates themselves changed, just that if you don’t have one, you no longer have the option of the three day government facility quarantine. I guess the airline just doesn’t let you board the flight to Japan without one now, or if you slip through, perhaps they deny you entry and put you on a flight back to your point of origination.
Curious if any articles in Japanese specify any other changes.