GHC Junior Heavyweight Championship
On July 5, Harada defeated Hajime Ohara in a four-man tournament final to win one of Noah's three spots in NJPW's 2016 Super J-Cup. On July 20, Harada was eliminated from the tournament in his first round match by Ryusuke Taguchi. Later that month back in Noah, Harada and Kotoge made it to the finals of the 2016 NTV G+ Cup Junior Heavyweight Tag League, but were defeated there by ACH and Taiji Ishimori. This led to a title match on August 21 at a NJPW show, where Harada and Kotoge defeated ACH and Ishimori for their fourth successful title defense, afterwards nominating Gedo and Jado as their next challengers. On October 8, Harada and Kotoge lost the title to Gedo and Jado. On November 22, Harada unsuccessfully challenged Kotoge for the GHC Junior Heavyweight Championship. On December 24, Harada and Kotoge regained the GHC Junior Heavyweight Tag Team Championship from Gedo and Jado. Two days later, Harada and Kotoge relinquished the title as Kotoge transitioned into Noah's heavyweight division. Harada received a GHC Junior Heavyweight Championship match on January 21, 2017, but was ultimately unsuccessful against defending champion Hajime Ohara. Momo no Seishun Tag formally disbanded on February 14, after Kotoge defeated Harada in a singles match. On February 18, Harada reunited with Tadasuke as the two stepped forward to challenge newly crowned GHC Junior Heavyweight Tag Team Champions Hi69 and Taiji Ishimori. Three days later, Harada and Tadasuke came together with Hayata and Yo-Hey to form a new stable named Ratel's. On March 12, Harada and Tadasuke failed to capture the GHC Junior Heavyweight Tag Team Championship from Hi69 and Ishimori.