In September 2006, Kensuke Office was announced as a member of the Global Professional Wrestling Alliance and they held their first show on February 11 and it was televised by Gaora TV.
On August 1 to August 4, 2011 they held their first tournament named Summer Volcano Tag Tournament and featured outside participants from Kaientai Dojo (Kaji Tomato), some other freelancers (Kikutaro, Kenichiro Arai, Namazu Man), from Pro Wrestling Noah (Genba Hirayanagi and Kentaro Shiga), and from DDT (Antonio Honda) with the winners eventually being Antonio Honda and Kento Miyahara.
On 5 October 2013 Nakajima received an opportunity for the GHC Heavyweight Championship and he lost to the defending champion Kenta.
On 24 November 2013 the Voodoo Murders did their last match on Diamond Ring and left the promotion and jumped to Pro Wrestling Zero1.
Following Sasaki's retirement, Diamond Ring was left with only one remaining wrestler, Katsuhiko Nakajima, with Satoshi Kajiwara resigning and Mitsuhiro Kitamiya joining Pro Wrestling Noah.