He currently serves as a commentator for Super GT on J Sports, partnering lead announcer Sascha Boeckle [ja] on its live broadcasts.

Mitsusada began competing in Japanese Formula Three in 1991 with Now Motor Sports and secured a podium in his first season with the team.

He also raced for the first time in Super GT with the Toyota Castrol Team, having close battles with the Lark McLaren F1.

For 1997, he switched to Cosmo Team Cerumo and saw greater success with three podium finishes and 4th place in the championship.

For 1998, Mitsusada moved away from Japan to compete in the final three rounds of the Formula 3000 International Championship with Nordic Racing.

[10] Mitsusada currently acts as one of the lead commentators for Super GT's live broadcast on J Sports, a role that he has had since at least 2018.