The popular "Black" Polyphonica, known for its hard-boiled style, is finally being adapted into a comic! Detectives Matia and Managa of the Luchazelius City Police's "Spirit Division" take on a difficult case! A murder occurs in a quiet residential area. A mysterious spirit, witnessed by the victim's daughter, Macarene, disappears from the crime scene. This spirit, who was once the victim's contracted spirit, is named Leongara Jess Borwardan. Is he the culprit?! This is a comic adaptation of "Shinkyoku Soukai Polyphonica Triangle Black" (GA Bunko), featuring the first appearance of Leon, a popular character who also has a spin-off series!