Adachi Yo is the pen name of a Japanese collaborative writing team consisting of Adachi O, a former film assistant director and screenwriter, and Adachi B, an avid reader and editor. Since their debut in 1994, they have written across a remarkable range of genres—including crime fiction, suspense, science fiction, erotic fiction, and police procedurals—under the motto “from SF to SM.” Known for fast-paced storytelling and cinematic narratives, they have built a long-running career in popular entertainment fiction. Their best-known work is the *Waru Deka* (*Rogue Detective*) series, while more recent titles such as the *Naikaku Ura Kanbō* (*Cabinet Back Office*) series and *Tensei Keiji* (*Reincarnated Detective*) further showcase their blend of action, mystery, and political intrigue.