RIZIN: Everything You Need to Know About Japan’s Premier MMA Organization RIZIN is a Japanese mixed martial arts (MMA) organization that has gained significant popularity in recent years. Known for its high-profile events, top-tier fighters, and thrilling fights, RIZIN has become a major force in the MMA world. Whether you’re a dedicated fan or a newcomer to the sport, this article will provide you with all the information you need to know about RIZIN.