Nakajima then participated in the 2006 Junior League tournament from June 25, 2006 to July 3, 2006, to decide a challenger for the Junior Heavyweight Championship; Katsuhiko won his block with five points, before losing in the final to Kaz Hayashi. On July 2, 2006, Nakajima's partner Kensuke Sasaki suffered a left eye fracture in a match against Katsuyori Shibata in BML, taking him out of action for the foreseeable future and forcing the team to vacate the All Asia Tag Team Championship on October 29, 2006 after holding the titles since July 2005.