On December 5, Davis adopted the new ring name Amber Gallows, the "Bullet Babe". On January 4, 2015, O'Neal made her debut for New Japan Pro Wrestling (NJPW) at Wrestle Kingdom 9 in Tokyo Dome, where she accompanied her husband and Karl Anderson to a match, where they lost the IWGP Tag Team Championship to Hirooki Goto and Katsuyori Shibata. On April 6, it was announced that O'Neal, billed as Amber Gallows, would be returning to NJPW the following month at Wrestling Dontaku 2015 to take part in the promotion's first match involving female wrestlers since October 2002. In the match, Gallows, her husband and Karl Anderson were defeated by Maria Kanellis, Matt Taven and Michael Bennett.