This paper argues the 2020 Tokyo Olympics has raised people’s awareness of concerns over radiation exposure as a form of social movement. One example is the Shinjuku demonstration, organized by the Network to Evacuate People from Radiation, which constantly advocates for protecting children from continuing radiation exposure. The group raised the issue that Olympic torch would pass through municipalities in Fukushima Prefecture where several high-level radiation hot spots are confirmed. Furthermore, concerns over radiation exposure have been also generating a grassroots movement to create the Chernobyl Law in Japan. This paper documents the emerging movement across the country, led by the Citizens’ Action for Fukushima Justice.