negative proof

There is a "vaccination certificate" in the Japanese government's official new corona vaccination certificate app. Read my number and passport and register.
Separately from this, there is an app of MySOS, which eliminates the need for "examination at the airport" and "waiting after entering the country" if the pre-test is negative when returning from overseas. Because this is not directly related to vaccination, it is not linked even though it is the same official app of the Japanese government.

If being  not infected when entering Japan from overseas, it is OK. Therefore, no vaccinations or pre-travel tests should be required, but this MySOS requires these proof voluntarily.

https://www.hco.mhlw.go.jp/fasttrack/en/

Of course, it is best not to send domestically infected patients to foreign countries, and first of all, it is better not to go abroad unless you are confident that you are not infected.

A smartphone is required for MySOS registration and quarantine.
Unfortunately, the screen of my smartphone is yellow because "the inspection certificate is not registered" at this moment.
In order to make this a fast track, t  it is necessary to take a test set by the Ministry of Health, Labor and Welfare overseas, obtain a negative certificate, register, and turn the screen blue.

All foreigners enter the country that way. Is it reasonable now that the infection is exploding in the country? I wonder if the purpose is to discriminate against overseas viruses. .
Now　I Worried about running out of smartphone battery・・・