Four thousand years ago in China, a form of kenpo martial arts called Juken ("Beast-Fist") was developed. It was created by a man named Brusa Ee, who built the hidden Jugenkyo (Beast Origin Village). Juken is a martial art in which one mimics the abilities of animals as well as trying to attain spiritual peace. However, dissent grew among the creator's ten students. Three of them believed that they should use the suffering and hatred harnessed within humans to increase their power, using their power to assume their monstrous forms; the Three Kenma. After Brusa Ee was murdered, the Kenma gathered followers to practice an evil form of the Juken style known as Rin Juken Akugata. The other seven students believed that true strength should come from within and engaged their former friends in a great war, ending the fight with a forbidden technique to seal the Kenma' powers at the cost of losing their own human forms in the process, becoming the Seven Kensei. Followers of the Kensei created the Geki Juken Beast Arts school: the Juken of justice whose sport discipline enhances the human body with the self-produced positive Qi called "Geki". It is taught by Grand Master Xia Fu, one of the seven Kensei, using a sports goods company named "SCRTC" as a front. By present time, a fallen student from the Geki Juken school named Rio turns to the Rin Juken style, rebuilding the Rinju Hall and bring the long-dead Rin Juken users back to life as kyonshi to collect Rinki, Geki's polar opposite Qi, in order to resurrect the Three Kenma so that through them, he can become stronger. To fight the new Rinju Hall, Xia Fu had been training two youths: Ran Uzaki and Retu Fukami. Along with Jyan Kandou, a feral boy raised by tigers in the woods near Jugenkyo, the Gekiranger team is formed and later joined by two other Geki Juken users, Gou Fukami, Retu's brother and master of the Geki Ju Wolf-Ken style, and Ken Hisatsu, a master of the Geki Ju Rhinoceros-Ken style, to save the world from the Akugata's ambitions. However, an even greater evil is using the two sides for its own agenda.