Cage Force
Finland's Jarkko Latomaki was Boku's first opponent in Cage Force. They faced each other at GCM: Cage Force 2 on March 17, 2007, and Boku came away the victor after knocking Latomaki out with an elbow in the first round. He then fought at Cage Force 3, 4 and 5, winning all but one fight which he lost to Artur Oumakhanov. After this, he went into DREAM for one fight. It was a loss to Joachim Hansen at the DREAM Lightweight Grand Prix 2008 Opening Round on March 15, 2008.