PlayChoice-10 is an arcade machine which can consist of as many as 10 different games previously available only on the Nintendo Entertainment System (NES) home console. The games for this system are in the modular form of circuit boards which are plugged into one of the ten open slots on the PlayChoice-10's motherboard. Double Dragon is the story of Billy and Jimmy Lee, twin brothers trained in the fighting style of Sou-Setsu-Ken. Together, they manage a small martial arts training school, teaching their students in self-defense. One day, Billy's girlfriend, Marian, is kidnapped off the street by the "Black Warriors", a savage street gang led by a man named Willy. The Black Warriors demand the Lee brothers disclose their martial arts secrets in exchange for Marian's freedom. The Lee brothers set out on a rescue mission to crush the Black Warriors and save Marian.