[2] In 1996 Onodera reached the #1 contender spot in the MAJKF promotion but left to compete for the All Japan Kickboxing Federation.

On May 25, 1996, Onodera participated in the inaugural Shin Nihon Kickboxing Association event in which he won the Featherweight title against hiroshi Oshiba by KO.

In 1997 Onodera was invited to the K-1 Grand Prix '97 Final to participate in a 4-man featherweight tournament alongside champions from other Japanese organizations.

After losing to Phetborai Chuwattana on March 26, 2003, Onodera took time off the ring and created his own kickboxing gym called RIKIX, it officially opened its doors in November 2003.

For his retirement fight on October 29, 2005, Onodera challenged Muay Thai champion Anuwat Kaewsamrit.