BUNGO STRAY DOGS: DEAD APPLE

The film's story involves a mystery case of power users around the world suddenly committing suicide one after another, in all cases after a strange fog appears at the scene. At a request from Ango Sakaguchi, the Armed Detective Agency head out to investigate Tatsuhiko Shibusawa, a power user who calls himself "collector," and a man suspected of being tied to the incident. (Source: Anime News Network) — Description from AniList community (anilist.co).