The Rinjuken Akugata (臨獣拳 アクガタ) or "Confrontation Beast-Fist Evil Style" is a Darwinistic school of martial arts and the main antagonists for the first half of Juken Sentai Gekiranger. They practice a brutal martial arts form of the same name involving the use of "Rinki" obtained through the negative emotions of their victims, as their ideology preaches a "survival of the fittest" mentality and focuses on the principles of natural selection. Their main goal is to conquer the world by eliminating their rival style of martial arts, the GekiJuuken, which they broke off from.
4000 years in the past, the martial artist Brusa E founded the Juuken ("Beast-Fist") style of martial arts and traveled to Japan, where he took on ten apprentices. However, three of his students betrayed their master by corrupting his teachings into the Rinjuken Akugata and killing him. These three would come to be known as the "Three Kenma" after using their corrupted style to assume monstrous animal forms and began to recruit more students to their cause of dominating the world. In response, the remaining seven Juuken students, the Kensei, founded the GekiJuuken martial arts school and fought their former comrades in the GekiRin Rebellion, which ended when the three Kenma were deprived of their mortal forms and sealed away.
In the present day, the Rinjuken style was revived by Rio, a former student of the Beast-Fist style who sought to become stronger. Reviving the former practitioners of Rinjuken to serve him, Rio sought to use the style to aid him in world domination. In response to the revival of the Rinjuken Akugata, the GekiJuuken school took on several students to form the Gekirangers to combat them.
- Three Fist Demons
- Rinjyuken Warriors
- Five Venom Fists