As a historian of premodern Japan active on Twitter, I seldom find myself embroiled in controversies in real time. I occasionally get pushback when I discuss the legacy of female emperors or nationalistic myths of ethnic homogeneity, but by and large, there's little trouble. So I hardly expected any powerful backlash in February of 2021 when I retweeted an article in The New Yorker by Harvard Law School professor Jeannie Suk Gersen on a contentious publication regarding comfort women. In the tweet I had simply remarked “This is a fabulous summary of how this event unfolded across media and academic circles, also placing the major issues in historical perspective.” The result, however, was a ferocious Twitter storm from historical denialists that came to absorb my life and the lives of a number of my colleagues for months thereafter.