Shinkyoku Sōkai Polyphonica franchise branched into several different series identified by color. Original series are known as crimson red, while the later series include black and white stories. This game is the only from the black series and setting is the same as in the original crimson red series, featuring two episodes. First episode takes place around the same time as episode 0 of the original series. The Black series feature Managa, a Rusha Police Department detective in a spirit division department, who is also a winged spirit himself, as one of the protagonists.
Initial release also included a bonus soundtrack featuring six tracks.
