At the end of the 20th century, violence ruled the city after the nuclear war. The people of the city were living in fear of the Black Warriors, a criminal organization that has acquired tremendous influence. On the outskirts of the city also lived twin brothers named Jimmy and Billy Lee, who were running their own kung-fu gym. One day, the Black Warriors were gathered on a certain spot after their usual rampaging of the city when a young woman accidentally stumbled into their meeting. The gang brutally murdered her without mercy. Her name was Marian, Billy Lee's girlfriend. With his older brother Jimmy, Billy sets out on a mission to get his revenge on the Black Warriors. Double Dragon II: The Revenge is a 1989 side-scrolling beat-'em-up released for the arcades by Technos. A Sega Mega Drive version was produced by PALSOFT in 1991. Unlike the earlier NES version that was developed in-house by Technos, which was a different game with a similar plot, this was intended to be a more direct conversion of the arcade game. While this version ended up being exclusive to Japan, other Double Dragon games (including a port of the first game) were later released for the Sega Genesis by other publishers in North America and Europe (which were conversely unreleased in Japan).