As a student, Okada won the All Japan Industrial High School Judo League Championship four times. After graduating from college, he trained at the
Seidokaikan Tokyo Bom-Ba-Ye dojo with Naoyuki Taira. He also joined the amateur division of
Shooto, placing second in its All Japan Amateur Shooto Championship in 1998 and 1999. In 2000, after Seidokaikan mainstay Masaaki Satake tried his luck in
Pride Fighting Championships, Okada followed him in order to do his own debut. He gained the ring name of "Giant Ochiai", sporting shades and a large
afro wig over his actual afro hair during his entrances, which drew popularity among fans. The origin of the name would be found in his large height and weight and his uncle,
NPB announcer
Hiromitsu Ochiai. Ochiai trained with former Shooto founder
Satoru Sayama and got to participate in his Ultimate Boxing event, a month later he debuted in Pride, fighting
Ricco Rodriguez in a losing effort. His performance, however, was remarkable, defending multiple submission attempts and only being taken down for a failed judo throw, until he was submitted by smother choke. He continued fighting for Pride, defeating karate stylist Soichi Nishida and professional wrestler Tomohiko Hashimoto, as well as
Pancrase exponent Kim Jong Wang. He would also fight in
King of the Cage. Also in 2000, Ochiai debuted in
professional wrestling, working sporadically in the
stiff style
Battlarts organizations. He joined
Riki Choshu's
World Japan promotion for proper training. ==Death==