Kengo Mashimo
After the folding of Apache Pro-Wrestling Army, Gentaro returned to Kaientai Dojo on May 5, 2009, reuniting with Yoshiya. On August 9, Gentaro and Yoshiya unsuccessfully challenged Makoto Oishi and Shiori Asahi for the Strongest-K Tag Team Championship. On September 23, Gentaro defeated Oishi to win the Independent World Junior Heavyweight Championship. Afterwards, Gentaro began spending more time in his new home promotion, Freedoms, but returned on April 2, 2010, to lose the Independent World Junior Heavyweight Championship to Marines Mask II. Gentaro's next Kaientai Dojo appearance took place on December 16, 2011, when he wrestled in Kengo Mashimo's tenth anniversary match, where Mashimo, Hiroki and Yasu Urano defeated Gentaro, Taka Michinoku and Yoshiya. On January 9, 2012, Gentaro and Hiroki entered the Kaientai Dojo Tag League, where they made it to the finals, before losing to Kengo Mashimo and Taka Michinoku on January 28. On February 4, Gentaro and Hiroki defeated Mashimo and Ryuichi Sekine in a tag team match, with Gentaro pinning Mashimo for the win. As a result, Gentaro was named the number one contender to Mashimo's Strongest-K Championship, but was defeated in the title match on February 26.