[1] Okada joined the Marunaka corporation in 1990, and continued his graduate studies at the University of Tsukuba until 1993.

In 1990, he moved up in weight to win the ‍–‍86 kg divisions of the Kodokan Cup and Asian Games.

[1] Okada won the Kodokan Cup again in 1992 before facing Yoshio Nakamura in the 1994 All-Japan Championships.

As a result, Okada seriously injured his left arm, suffering a torn ligament and a dislocation.

Okada won another international competition in Germany before announcing his retirement in December 1995.