Kirk here with news of 711 positives and some clusters, including one at Luther High School (volleyball team). The link is to a video report by NHK. In addition, though the specific schools are not mentioned, “class closure” (gakkyu heisa; 学級閉鎖) is being undertaken at quite a few primary and secondary schools. My understanding is that “class closure” means that pupils in thoses classes will not attend school until the class is reopened. I assume that this means that entire schools will not shut down (at least not right away) but that certain classes within them are being shut down in order to prevent further spread of COVID-19. By the way, my university is quickly transitioning to nearly 100% online classes. We need to notify the university if we want one of our classes to be an exception to this policy for some reason.