The mystery pulls you in as a locked-room problem, then reveals it's actually about why someone would want to erase the very thing that makes you special. Every suicide in this fog is a person choosing non-existence over their own power, and the movie doesn't flinch from asking what kind of world makes that choice seem reasonable. By the end you're not solving a case, you're watching characters realize that saving someone's life means convincing them it's worth living in the first place.
Power users across the globe are dropping dead, each suicide preceded by an inexplicable fog. The pattern is deliberate. The deaths are connected. When government operative Ango Sakaguchi reaches out with a request, the Armed Detective Agency pivots from their usual cases toward something far darker: a man named Tatsuhiko Shibusawa who collects abilities like some people collect art. Shibusawa isn't just any suspect. He carries himself with the confidence of someone who's already won, speaking in riddles about what he's building. The fog that precedes each death might be his handiwork, or it might be something he's unleashed. Either way, it's spreading. The agency splits between investigation and survival as the mystery tightens around them. Every lead pulls them closer to Shibusawa's true endgame, and every answer raises a harder question: can they stop a man who's already learned to steal the very thing that makes his targets unique? Time runs short as the fog continues its march across the world.