Update: Denmark, Lichtenstein and Austria also require entry registration or the carrying of documents as of this week. In Hungary and Cyprus, a registration form is available for entry via plane.
From Dec. 28, 2020 to Jan. 31, 2021, there will be a worldwide ban on entry to Japan for foreign nationals. This development includes the following residence/visa titles: temporary business visas (up to 90 days), working holiday visas and long-term visas (visas with Certificate of Eligibility).
Business trips are associated with special difficulties in times of COVID-19. This does not only apply to the practical problems of implementation, for example due to restricted travel options or special regulations for entry and quarantine. One special regulation that many countries have adapted is an entry declaration prior to travel.