rebirth for the villainous Bullet Club stable, when Yujiro Takahashi turned on the Chaos stable and joined Bullet Club by helping A.J. Styles defeat Kazuchika Okada for the IWGP Heavyweight Championship. The undercard of Back to the Yokohama Arena would feature Takahashi's first match as a member of Bullet Club, when he teamed with his new stablemates in an eight-man tag team match. The event also featured Bullet Club's Bad Luck Fale taking on Tetsuya Naito in a match, where NJPW suggested the winner could enter a singles title picture. The two previously faced off in the second round of March's New Japan Cup, where Fale was victorious. In the main event of the show, Okada would receive his rematch for the IWGP Heavyweight Championship. His opponent would be the winner of a title match between Styles and Michael Elgin at War of the Worlds, a NJPW and Ring of Honor (ROH) co-promoted event in New York City on May 17. Okada was eventually added to the match, making it a three-way. Styles, however, retained his title by pinning Elgin, making the match between him and Okada official for Back to the Yokohama Arena. Event In the first title match of the event, Tencozy made their second successful defense of the NWA World Tag Team Championship in a three-way match with Tenzan pinning Brisco for the win. Post-match, K.E.S., having not been involved in the finish, challenged Tencozy to a future title match. The next match featured a major storyline development in the long storyline rivalry between Minoru Suzuki and Toru Yano. Before the match started, Lance Archer blocked referee Tiger Hattori's view of the ring, while Yano's Chaos stablemate and tag team partner Takashi Iizuka, with whom he had held both the IWGP and GHC Tag Team Championships, turned on him, hitting him with his signature iron claws. Archer then released Hattori to start the match and count a quick pinfall win for Suzuki over Yano. Post-match, Iizuka put on a shirt of Suzuki's Suzuki-gun stable. In the second title match of the event, Tomohiro Ishii made his fourth successful defense of the NEVER Openweight Championship against IWGP Junior Heavyweight Champion Kota Ibushi. After the match, Ishii was attacked by his former Chaos stablemate Yujiro Takahashi, who set himself up as his next challenger. In the next match, Hiroshi Tanahashi and Togi Makabe defeated Hirooki Goto and Katsuyori Shibata