Otsuka became one of the greatest Battlarts stars, feuding with Daisuke Ikeda and Yuki Ishikawa in violent matches and brawls, and being also part of the Love Warriors tag team along with Mohammed Yone.
In 2006, Otsuka started competing in Michinoku Pro Wrestling under the gimmick of Otoko Sakari, a bisexual comedy wrestler who wore a fundoshi and utilized sexual antics against his opponents.