Giulia comments

The only way to get a test result in 48h is to go through a private clinic (the average cost in my country is 120€). Even then, they won't take responsibility in case of delay.

Plus, most test centers are closed on weekends... That means we could only fly back on Wednesday evening (in optimal conditions)/Thursday/Friday.

I would want to take a private test upon arrival in Europe before I meet my family.

If I had a 2 weeks holidays, 1 week would be gone for testing and flying on weekdays would substantially shorten my time (I'd have 4 free days out of 14).

I hope they can speed up the testing process...

Also, if we can't take public transports in Japan, how are we expected to go home?

Is it ok to rent a car at the airport or have a friend pick me up (even if they don't live with me?)