 For the rest of 2006, the band toured constantly, releasing another online live album, "Zazen Boys Live at Okinawa 2006".In early 2007, Hidekazu left Zazen Boys to pursue other projects, and was replaced by former Nine Days Wonder and 12939db bassist Ichirō Yoshida.On September 17, 2008, the band released their fourth studio album, "Zazen Boys 4".