日テレG+杯争奪ジュニアヘビー級タッグ・リーグ戦
On December 6, Kotoge won his first singles title, when he defeated former partner Daisuke Harada for the GHC Junior Heavyweight Championship. He made his first successful title defense in a rematch with Harada on January 24, 2015. He lost the title to Taichi in his second defense on March 15, following repeated outside interference from Taichi's Suzuki-gun stablemates El Desperado and Taka Michinoku. Kotoge received a rematch for the title on May 10, but was again defeated following outside interference from El Desperado and a steel chair shot from Taichi. On May 24, Kotoge represented Noah in Lucha Libre AAA Worldwide's Lucha Libre World Cup in Mexico City. Team Noah, made up of Kotoge, Taiji Ishimori and Yoshihiro Takayama was defeated in the first round of the tournament by the Dream Team (Myzteziz, El Patrón Alberto and Rey Mysterio Jr.). Back in Noah, Kotoge made it to the finals of the 2015 Global Junior Heavyweight League, but was defeated there on August 5 by Daisuke Harada. On August 22, Kotoge and Harada announced they were reuniting for the 2015 NTV G+ Cup Junior Heavyweight Tag League, which would mark their first matches together as a tag team in four years. On September 22, Kotoge and Harada finished their round-robin block in the tournament with a record of three wins and one loss, winning their block and advancing to the finals. Later that same day, they defeated the reigning GHC Junior Heavyweight Tag Team Champions El Desperado and Taka Michinoku in the finals to win the tournament. This led to a match on October 4, where Kotoge and Harada defeated El Desperado and Taka Michinoku to win the GHC Junior Heavyweight Tag Team Championship, becoming the first Noah wrestlers to reclaim one of the four GHC titles from the Suzuki-gun stable. Afterwards, Kotoge and Harada continued feuding with Suzuki-gun by successfully defending their title against members of the stable; first defeating El Desperado and Michinoku in a rematch on December 23, then defeating Taichi and Michinoku on January 31, 2016, and finally defeating Taichi and Yoshinobu Kanemaru on February 19. On March 19, Kotoge and Harada lost the title to Hajime Ohara and Kenoh. Kotoge and Harada regained the title in a rematch on April 5. They then went back to defending the title against Suzuki-gun, defeating El Desperado and Taka Michinoku for their first successful defense on April 30, before defeating Ohara and Kenoh in a title rematch on May 28. On June 12, Kotoge and Harada won a three-way match, defeating the Suzuki-gun team of Michinoku and Taichi as well as Gedo and Jado, to make their third successful title defense. The following month, Kotoge and Harada 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 Kotoge and Harada defeated ACH and Ishimori for their fourth successful title defense, afterwards nominating Gedo and Jado as their next challengers.