In November, Styles entered the IWGP Intercontinental Championship picture by challenging Shinsuke Nakamura to a title match. Later that month, Styles was forced to pull out of the 2015 World Tag League, where he teamed with Yujiro Takahashi, after suffering a back injury. Styles returned to the NJPW ring on January 4, 2016 at Wrestle Kingdom 10 in Tokyo Dome, where he unsuccessfully challenged Shinsuke Nakamura for the IWGP Intercontinental Championship. Hours after Styles' Wrestle Kingdom 10 match, it was reported that Styles had given his notice to NJPW on the morning of January 4, announcing that he was leaving the promotion and signing with WWE. The following day, Styles made his final appearance for NJPW, where the rest of Bullet Club turned on him with Kenny Omega becoming the stable's new leader.