[3] In 2018, Coughlin entered the New Japan Pro-Wrestling LA Dojo, as the first class along with Karl Fredericks and Clark Connors, training under Katsuyori Shibata.
Coughlin visited Japan for the first time as a representative of the LA Dojo at the Young Lion Cup held in September 2019 and came third in the tournament along with Connors with 8 points.
Whilst Fredericks and Connors achieved more success, Coughlin continued to train and lose to New Japan wrestlers, due to having less wrestling background prior to joining the Dojo.
[6][7] On January 4, 2020, at Wrestle Kingdom 14, Coughlin, Fredericks, Connors and Toa Henare defeated Tencozy (Satoshi Kojima and Hiroyoshi Tenzan), Yota Tsuji and Yuya Uemura in an eight-man tag-team match.
[11][12] Coughlin returned in November on the pre-show of Historic X-Over, teaming with LA Dojo stablemates, Clark Connors, Kevin Knight and Gabriel Kidd to defeat Kosei Fujita, Oskar Leube, Ryohei Oiwa and Yuto Nakashima.
[15] The following month at Multiverse United, Coughlin teamed with Sami Callihan, Fred Rosser and PCO to defeat Eddie Edwards, Joe Hendry, Tom Lawlor and J. R.
[23] On October 9 at Destruction in Ryōgoku, Coughlin and Kidd lost the Strong Openweight Tag Team Titles to Guerrillas of Destiny (El Phantasmo and Hikuleo), ending their reign at 97 days.
[27] On February 11, 2024 at The New Beginning in Osaka, Coughlin teamed with the rest of his Bullet Club War Dogs teammates, to defeat United Empire in a ten-man steel cage match.
[28] Coughlin returned to ROH in April 2023, teaming with his LA Dojo trainer Katsuyori Shibata, to defeat The Workhorsemen (Anthony Henry and J.D Drake).