Horror manga is enjoying something of a flourishing in American fandom at the moment: Tokyo Ghoul has been one of the largest successes publisher Viz has enjoyed in years, with its popularity to the point that its live-action adaptation is coming to American theaters later this month. And that’s not the only big success for what at first glance are niche publications. Mega-hit Attack on Titan poses as a grungy action blockbuster, but the bulk of its appeal derives from its nihilistic and unsettling atmosphere and the ever-present threat of the titular monsters.