In 2016, the first anti-hate speech law in Japan was introduced against the backdrop of verbal attacks on ethnic Koreans who were targeted with particular force by radical right organizations in the early 21st century. We argue that while the role of social media in the proliferation of hate speech in Japan has received considerable attention, the coverage of hate speech and related issues in mainstream news media has not been sufficiently studied. This article offers an interdisciplinary analysis, grounded in media studies and in linguistics, of the positions of five national newspapers in public discourse about hate speech, discussed as a current issue in Japan from 2016 until mid-2018. We combine agenda-setting theory with discourse analysis of factual reporting in order to evaluate the Japanese media landscape, which, when scrutinized through the lens of the hate speech issue, reveals ideological polarization.