Having worked for AJPW for most of his career, Bushi transferred to NJPW in April 2012 initially temporarily, with the move becoming permanent in January 2013.

[8] In late 2008 it was announced that T28 would undertake a "learning excursion" to Mexico to help him gain international experience, a tradition for many young Japanese wrestlers.

He wrestled his last match for AJPW on September 19 before travelling to Mexico.In Mexico, Tetsuya Shimizu began learning the lucha libre style under Skayde.

[1] On January 29, 2009, he made his debut for the Naucalpan, State of Mexico based International Wrestling Revolution Group (IWRG), working as a masked rudo (bad guy) character called Tetsuya.

After losing a tag team match he was attacked by his partner Fantasma de la Opera and Tetsuya Bushi was turned technico (good guy).

[13] Traditionally foreign wrestlers who travel to Mexico to learn lose an Apuesta match and either unmask or have their hair shaved before their tour ends.

[13] Tetsuya Bushi's tour of Mexico ended in January 2010 when he lost the IWRG Intercontinental Lightweight Championship to Dr. Cerebro.

On April 11, 2010, Bushi received his first shot at the World Junior Heavyweight Championship, but champion Kaz Hayashi successfully defended the title against Bushi in a very close match, a testament to the improvements he had made in Mexico[15] He teamed up with Super Crazy to win the 2010 Junior Tag League, defeating Hiroshi Yamato and Shuji Kondo in the final.

[17] On April 16, 2012, New Japan Pro-Wrestling announced it had reached an agreement with AJPW, which would see Bushi switch promotions in what was referred to as a "one year rental transfer".

[18] Bushi debuted as a NJPW wrestler in the 2012 Best of the Super Juniors tournament, where he won three out of his eight round-robin stage matches and finished second to last in his block.

[25][26] In an unusual role for Japanese wrestlers in CMLL, Bushiroad was positioned as a technico, leading to Okumura of La Fiebre Amarilla branding him a traitor for going against his own people.

[29][30] On October 13 at King of Pro-Wrestling, Bushi unsuccessfully challenged the visiting Chase Owens for the National Wrestling Alliance (NWA) World Junior Heavyweight Championship.

[31] On December 19, Bushi suffered an epidural hematoma, cervical cord neurapraxia and a thoracic vertebrae fracture, which were estimated to sideline him for six months.

[35] However, the following day this was revealed to be a storyline as Bushi accompanied Tetsuya Naito and Evil to their match, joining their villainous Los Ingobernables de Japón (L.I.J.)

[36] On December 9, Bushi attacked Máscara Dorada after he refused to join L.I.J., ripped off his mask and stole the CMLL World Welterweight Championship belt, setting up a future title match between the two.

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

[55] On December 17, Bushi, Evil and Sanada lost the NEVER Openweight 6-Man Tag Team Championship to Bullet Club's Bad Luck Fale, Tama Tonga and Tanga Loa in their fourth defense.

[58] After Hiromu Takahashi was injured at the G1 Special in San Francisco, tournament for a vacated IWGP Junior Heavyweight Championship was announced.

Bushi and the newest member of Los Ingobernables de Japón, Shingo Takagi, took part in 2018 Super Junior Tag Tournament.

They qualified to the final, where they lost in a three-way tag team match to Roppongi 3K, also involving El Desperado and Yoshinobu Kanemaru.

[67] This gave Bushi an opportunity to win the Cup, and in his first round match, he defeated Yoh, who injured his ACL in the process.

[70] On August 1, NJPW vacated the NEVER Openweight 6-Man Tag Team Championship due to Evil having turned on Los Ingobernables de Japón during the final of the New Japan Cup and claiming he had "no interest" in defending the title.

In November, Bushi competed in the Best of the Super Juniors tournament, but finished with 10 points (5 wins and 6 losses), failing to advance to the finals.