On January 10, 2005, Michinoku defeated Kaz Hayashi for the Strongest-K Championship, the highest honor one can achieve in Kaientai Dojo. Michinoku started a feud with Kazma, which led to several championship matches between the two where Michinoku would come out on top. He would go on to beat Bambi in the finals of Strongest-K 2005. The beginning of 2006 proved to be a problem for Michinoku as on January 6, 2006, he would lose the Strongest-K Championship to JOE, holding the championship for almost one year and making him the longest Strongest-K Champion up to that point.