Yujiro Takahashi
In January 2015, Hall began training at the New Japan Pro-Wrestling dojo. On January 5 at "New Year Dash!!", Hall debuted as Bullet Club's personal "young boy" trainee. Hall made his NJPW in-ring debut on February 2, teaming with his stablemates Doc Gallows, Karl Anderson, Kenny Omega and Yujiro Takahashi in a ten-man tag team main event, where they were defeated by Captain New Japan, Hirooki Goto, Katsuyori Shibata, Ryusuke Taguchi and Hiroshi Tanahashi, who pinned him for the win. As is usually the case with "young boys" in Japan, Hall would lose many of his first matches with NJPW, and often be pinned in multi-man tag matches, but achieved his first victory on April 29 at "Wrestling Hinokuni" in a tag team match, where he and Yujiro Takahashi defeated Captain New Japan and Satoshi Kojima. Hall, however, was not involved in the finish of the match. Over the next year, Hall mainly worked tag team matches with his Bullet Club stablemates, while also becoming an enforcer for The Young Bucks (Matt Jackson and Nick Jackson). Hall scored his first win himself on April 2, 2016, when he submitted rookie Hirai Kawato in a singles match. Hall was injured later that month at Invasion Attack 2016, and remained sidelined until January 2017, when his profile was quietly removed from NJPW's roster page, signaling his departure from the promotion.