Later that month, Roppongi 3K entered the 2017 Super Jr. Tag Tournament for the first time, defeating Hirai Kawato and Kushida in the first round and"Los Ingobernables de Japon" (Bushi and Hiromu Takahashi) in the semifinals, before defeating Super 69 (ACH and Ryusuke Taguchi) in the finals at Power Struggle on November 5, becoming the first team to win the tournament as the current NJPW Junior Heavyweight Tag Team Champions. On January 4, 2018, Roppongi 3K lost the IWGP Junior Heavyweight Tag Team Championship to The Young Bucks (Matt Jackson and Nick Jackson) at Wrestle Kingdom 12 in Tokyo Dome, before winning it back on January 28 at The New Beginning in Sapporo. They soon dropped the titles to El Desperado and Yoshinobu Kanemaru of Suzuki-gun on New Japan's 46th Anniversary Show, in a three-way tag team match which also involved of Bushi and Hiromu Takahashi (the later being their former CMLL stablemate as Kamaitachi) of "Los Ingobernables de Japon". They would then lose their title rematch on June 9 at Dominion 6.9 in Osaka-jo Hall, but would fail to regain the titles. Sho and Yoh they entered the 2018 Super Junior Tag Tournament, which was now using a point-based system instead of brackets; they would go on to win 5 matches out of 7 and scoring 10 points; they would then face the other two top-scoring teams, El Desperado and Kanemaru and Bushi and Shingo Takagi of "Los Ingobernables de Japon", in a three-way tag team match at Power Struggle where Roppongi 3K became the first team (and individuals) to win the tournament twice. The three teams would face off again on January 4 at Wrestle Kingdom 13 for El Desperado and Kanemaru's IWGP Junior Heavyweight Tag Team Championship, but Bushi and Takagi would win the match. At NJPW's 47th Anniversary Show on March 6, Roppongi 3K defeated Bushi and Takagi to win the titles for a third time, eventually losing them to El Phantasmo and Taiji Ishimori of Bullet Club on June 16 at Kizuna Road. After Yoh pinned the Guerrillas of Destiny's Tanga Loa during a 10-man tag team match at Destruction in Kobe, Roppongi 3K received a title match for the Guerillas of Destiny's IWGP Tag Team Championship at Fighting Spirit Unleashed (their first opportunity at the title), but were unsuccessful.