The promotion additionally announced a four-woman single-elimination tournament to determine the inaugural champion to be held at Resurgence on May 21, in Long Beach, California.

[1] The tournament will feature representatives from NJPW's partners All Elite Wrestling (AEW), Consejo Mundial de Lucha Libre (CMLL), and Stardom.

[1] The tournament participants are the former IWGP Women's Champion Mercedes Moné (NJPW), Momo Kohgo (Stardom), Stephanie Vaquer (CMLL), and Willow Nightingale (AEW).

[5] The first defense of the title was Nightingale's successful defence against Emi Sakura on the 2nd June 2023 edition of AEW Rampage (taped on the May 31, 2023).

She won the title by defeating Stephanie Vaquer in a Winner Takes All match also for Moné's AEW TBS Championship at Forbidden Door on June 30, 2024, in Elmont, New York.