A global disaster of epic proportions is unfolding, as a strange fog reveals the tragic suicides of ability users. In an effort to get to the bottom of these unexplained fatalities, the Armed Detective Agency launches a full-scale investigation. Their task is to uncover the identity of a mysterious and dangerous ability user known as the "Collector", who might be manipulating events behind the scenes. The stakes are high and there is no room for error, as the Armed Detective Agency races against time to save not only Yokohama, but the entire world from the Collector's malevolent plot. Joining forces with the deeply feared Port Mafia, the agency's trust and bravery will be put to the test like never before.