Hirokazu Nagai , better known as Mitsuya Nagai , is a Japanese mixed martial artist, professional wrestler and former kickboxer. A professional MMA competitor from 1991 until 2013, he fought the majority of his career in Fighting Network RINGS. Once a student of legendary professional wrestlers Satoru Sayama and Akira Maeda, Nagai holds notable victories over former King of Pancrase Super Heavyweight Champion Tsuyoshi Kosaka, Nobuaki Kakuda, four-time world kickboxing champion Andre Mannaart, Russian sambo champion Mikhail Ilyukhin, RINGS King of Kings 2000 Tournament runner up Valentijn Overeem, ADCC bronze medallist and RINGS Light Heavyweight title contender Chris Haseman, and Pancrase veteran Takaku Fuke. He also fought for K-1 in kickboxing.

Akira Maeda is a Japanese mixed martial arts promoter, writer and retired professional wrestler and mixed martial artist. Maeda was also known by the ring name Kwik-kik-Lee during his time on the British wrestling's slot on the sports show World of Sport (WoS). Maeda helped develop the shoot-style of professional wrestling during the late 1980s. He founded Fighting Network RINGS in 1991 which would become one of the top MMA promotions before it folded in 2002.