After debuting in NJPW in 2011, Evil competed in the United States on excursion, working for companies such as Global Force Wrestling (GFW) and Ring of Honor (ROH) from 2014 to 2015.

On October 12, 2015, Watanabe returned to NJPW at King of Pro-Wrestling, where he was revealed as Tetsuya Naito's associate during his match against Hiroshi Tanahashi.

Watanabe's outside interference in the match was stopped by Hirooki Goto and Katsuyori Shibata, leading to Naito suffering a loss.

[2] In December, Evil and Naito won their block in the 2015 World Tag League with a record of five wins and one loss, advancing to the finals of the tournament.

[12] From July 18 to August 14, Evil took part in the 2016 G1 Climax where he finished his block with four wins and five losses, thus failing to advance.

[16] On January 4, 2017, at Wrestle Kingdom 11 in Tokyo Dome, Evil, Bushi and Sanada won a four-team gauntlet match to become the new NEVER Openweight 6-Man Tag Team Champions.

[17] They lost the title to Hiroshi Tanahashi, Manabu Nakanishi and Ryusuke Taguchi the next day,[18] before regaining it on February 11 at The New Beginning in Osaka.

lost the NEVER Openweight 6-Man Tag Team Championship to Hiroshi Tanahashi, Ricochet and Ryusuke Taguchi in their second defense,[21] before regaining it on May 3 at Wrestling Dontaku 2017.

[26] In December, Evil and Sanada won their block in the 2017 World Tag League with a record of five wins and two losses, advancing to the finals of the tournament.

[27] On December 11, they defeated Guerrillas of Destiny (Tama Tonga and Tanga Loa) in the finals to win the tournament.

[28] Six days later, Evil, Bushi and Sanada lost the NEVER Openweight 6-Man Tag Team Championship to Guerrillas of Destiny and Bad Luck Fale in their fourth defense.

[29] On January 4, 2018, at Wrestle Kingdom 12 in Tokyo Dome, Evil and Sanada defeated the Killer Elite Squad (Davey Boy Smith Jr. and Lance Archer) to win the IWGP Tag Team Championship for the first time.

[30] Evil and Sanada would successfully defend the IWGP Tag Team Championship on two occasions before losing the title to The Young Bucks at Dominion 6.9 in Osaka-jo Hall ending their reign at 156 days.

When Naito came out to congratulate him on his win, Evil threw up the "too sweet" symbol of Bullet Club instead of the raised fist of Los Ingobernables, then attacked Naito, turning heel, and was soon joined by Bullet Club, establishing himself as a member of the stable and the first person to ever leave Los Ingobernables de Japón.

[47][48] At Sengoku Lord on July 25, he had his first successful defense of both the Heavyweight and Intercontinental titles against former Ingobernables stablemate Hiromu Takahashi.

[49] On August 1, NJPW vacated the NEVER Openweight 6-Man Tag Team Championship due to Evil claiming in a post-Dominion interview that he had "no interest" in defending the title with his former Ingobernables stablemates, ending his run as triple champion.

[60] At Dominion 6.12 in Osaka-jo Hall, House of Torture retained the 6-man championships against Suzuki-Gun, but lost them to Chaos at NJPW New Japan Road.

[65][66] In the semi-final round, Evil lost to eventual winner Zack Sabre Jr..[67] At Battle Autumn, House of Torture retained their 6-man tag team titles against Hiroshi Tanahashi, Ryusuke Taguchi and Hikuleo.

[69] The following day at New Year Dash, Evil, Takahashi and Dick Togo defeated Tomoaki Honma, Tiger Mask and Ren Narita.

[71] In March, Evil participated in the New Japan Cup, defeating Ren Narita and Jeff Cobb, in the first two rounds.

!, during a post-match interview, Evil attacked Tama Tonga and made the challenge for his title, but also humiliated the newly crowned champion as he cut off some of his hair.

[83] At Sakura Genesis, Evil lost the NEVER Openweight Championship to Shingo Takagi, ending his third reign at 77 days.

[86] On February 11 at The New Beginning in Osaka, Evil returned after a brief hiatus, where he and the rest of House of Torture attacked Yota Tsuji and Gabe Kidd after their match and proceeded to kick Kidd and the rest of Bullet Club War Dogs out of Bullet Club, despite not having leadership in the main stable and starting a civil war between the two sub-groups.