"Double Dragon (\u30C0\u30D6\u30EB\u30C9\u30E9\u30B4\u30F3) is a beat 'em up video game series initially developed by Techn\u014Ds Japan, who also developed the Kunio-kun series (Renegade, Super Dodge Ball and River City Ransom).The series stars twin brothers, Billy and Jimmy Lee, who are followers of a fictional martial art called S\u014Dsetsuken (\u53CC\u622A\u62F3), as they fight against various adversaries and rivals. Due to the popularity of the game series, an animated series and live-action film adaptation have also been produced."@en .