After being a mainstay for the Pro Wrestling NOAH promotion where he seized GHC Junior Heavyweight and Heavyweight gold, KENTA sought to test himself in America for five years. On his return to Japan in 2019, his long time friend Katsuyori Shibata pushed for KENTA to join NJPW, and at Dominion on June 9, he made his first appearance, vowing to be part of the G1 Climax. 

KENTA started strongly in the G1, but he was met with boos from a crowd who didn’t see KENTA as one of their own. On the last night of the G1, he was to tag with Tomohiro Ishii and YOSHI-HASHI against a BULLET CLUB trio of Bad Luck Fale, Tama Tonga and Tanga Loa. Midway through the match however, he refused to tag Ishii and dropped off the apron. A Go2Sleep to Ishii later, and KENTA had joined BULLET CLUB. As BULLET CLUB instilled a ‘win at all costs’ mentality in KENTA, he took the approach to victory, winning the NEVER Openweight Championship, and, after nearly two years of chasing, the IWGP United States heavyweight Championship.

Stating that he would keep his title until he faced a specific opponent he had in mind, the confident KENTA defended his title in a no disqualification war with Hiroshi tanahashi at Wrestle Kingdom 16. Yet after a terrifying fall from a ladder, and High Fly Flow through a table, KENTA sustained a dislocated hip, broken nose and finger and severe lacerations, starting 2022 on the injured list before returning for G1 Climax 32.