Sirens

Yuki Inokuma and Shinobu Satomi of the Musashi Prefectural Police are detectives in the Mobile Investigation Unit (commonly known as "Kisou"), which handles the initial investigation of all types of cases. The two work together as "partners," but in reality, they are also lovers (of course, it's a secret at the workplace). The two of them encounter Tachibana at a scene where a suspicious body was discovered...