仮面ライダーカブト
2006 saw Sakaguchi in more mainstream roles, such as Yashamaru in ', and "Grave" in "Death Trance". He also guest-starred in the Japanese tokusatsu show, "Kamen Rider Kabuto", as the villain Reiji Nogi/Cassisworm. In 2008, Sakaguchi made his directorial debut with "Sakigake!! Otokojuku" (a.k.a. "Samurai School"), in which he also starred, wrote the screenplay, and choreographed the action sequences. He made a cameo appearance in Yoshihiro Nishimura's 2008 exploitation film, "Tokyo Gore Police", as well as directed/starred in ', based on a story by Ryuhei Kitamura.