The state of the city of Lisvalletta. Two suns rise above this city, and the people here live peaceful lives, but in the shadows crime and illegal drugs run rampant. Among them is the dangerous and highly lethal drug "Anthem" that casts a dark shadow over the city. The SEVEN-O Special Crime Investigation Unit specializes in taking strong action against Anthem. This unit operates on two "friends" teams in what is called the "Two Story System" to address the problem. Doug Billingham is an experienced researcher, and is joined by Kirill Vrubel, whose abilities are mysterious and unknown