He moved to Gamba Osaka in 2008 but he failed to claim a regular place there.

In June 2005, Mizumoto was selected Japan U-20 national team for 2005 World Youth Championship.

In August 2008, he was selected Japan U-23 national team for 2008 Summer Olympics.

[citation needed] Mizumoto made his senior national team debut on 4 October 2006, in a friendly match against Ghana.

This biographical article related to a Japanese association football defender born in the 1980s is a stub.