On July 31, 2015, Nakajima left Diamond Ring. On December 24, 2015, Noah held a press conference announcing that Nakajima would be ending his days as a freelancer and officially joining the promotion on January 1, 2016. On February 24, 2016, Nakajima picked up the biggest win of his career by defeating Minoru Suzuki in the main event of Noah's show in Korakuen Hall. As a result, Nakajima was granted a shot at the GHC Heavyweight Championship, but was defeated by Takashi Sugiura on March 19.