Due to the global spread of the Novel Coronavirus(COVID-19)in 2020, online classes were held also in Japan to prevent infection. Online classes using iPads were conducted entirely from the beginning of the first semester of April at Nagoya Bunri University, and face-to-face classes were conducted with infection prevention measures after the reduction in infection risk in Aichi prefecture. Face-to-face classes were held after a school closure period at high schools in Aichi prefecture. After that the early distribution of tablet devices to high school teachers was decided. We report on the case studies of high school-university cooperation and online classes at universities and high schools. The advantages and disadvantages of online classes and face-to-face classes are discussed, and the post-corona Hybrid and Hy-Flex-model based education is proposed.