A small number of tour groups from four countries will be allowed to enter Japan on a trial basis this month.

The number of tourists allowed in and the maximum number of people in a group were not announced.

Excerpt from the Washington Post:

In a test to prepare for a larger resumption of travel, the country is planning to allow about 50 vaccinated-and-boosted travelers to visit as part of organized tours later this month, the Japan Tourism Agency said Tuesday. The pool of 50 travelers will be allowed from four countries Japan has designated as priority markets: the United States, Australia, Thailand and Singapore.

It wasn’t immediately clear how the travelers would be selected, or which tour companies would be involved. The Associated Press reported that each tour group would be capped at four people.

Conclusion.

This reminds me of the announcement Japan made earlier that they would remove the entry ban of foreigners, but didn't mention that non-citizens would need a visa that is not currently issued for tourism purposes.

I don't think it's possible to draw many conclusions from allowing a maximum of 50 tourists from four countries that are on North Korea-style tours to come to Japan.

In June, the maximum international arrivals will increase from 10,000 to 20,000, including returning Japanese.