Other PITA: the PCR test before boarding the flight to Japan. Which has to be within 48 or 72 hours of departure and a specific form filled by a doctor about what type of test, the result, etc.
Ah yes, the specific form. Frankly given than in France test are valid only 24 hours for the "fuck your freedom pass" the 72 hours validity feels a long time and making an additional paper filled wasn't too much annoying. The highest ranking personal in the laboratory (not a doctor) signed and that was ok. I guess Japanese car more about the seal part.