At the age of 12 he became a fan of professional wrestling, especially Masahiro Chono, who inspired Takahashi to work hard in school to become a member of the track and field team.

[4] He passed the test and was accepted into the NJPW Dojo,[4] where he trained in the same class as King Fale and Kyosuke Mikami, who all made their in-ring debut around the same time.

[5] Takahashi followed the traditions of NJPW's "Young Lions" (their term for rookies), wrestling in all black trunks and boots, usually losing the majority of their matches as part of their ongoing training regiment.

[6] Three weeks later, exactly six months after his debut, Takahashi finally won his first ever singles match as he defeated Kazuki Hirata of the Dramatic Dream Team (DDT) promotion at NEVER.5.

[8] On October 10, 2011, Takahashi and Mikami teamed up to defeat King Fale and Takaaki Watanabe in the dark match of the Destruction '11 pay-per-view event.

[10] During the tournament Takahashi lost to Alex Koslov, Daisuke Sasaki, Brian Kendrick, Jado, Low Ki, Ryusuke Taguchi, and Tiger Mask and only defeated Taka Michinoku.

[11][12][13][14][15][16][17][18] He would later team up with fellow "Young Lions" Mikami & Takaaki Watanabe to compete in the "J Sports Crown Openweight 6 Man Tag Tournament".

[20] During the summer of 2013 he was once again allowed to compete in the annual Best of Super Juniors, but lost all matches, taking pinfalls against Jyushin Thunder Liger, Prince Devitt, Titán, Taichi, Ricochet, Beretta, Rocky Romero, and Alex Shelley.

[21][22][23][24][25][26][27][28] NJPW often sends their "Young Lions" on a learning excursion outside Japan, be it the United States of America, Europe or Mexico, and in the summer of 2013 it was Takahashi's turn.

Much like Mikami before him, Takahashi was teamed up with CMLL's resident Japanese worker Okumura as part of La Fiebre Amarilla ("The Yellow Fever").

[36] At the following day's Fantastica Mania 2016 event, Kamaitachi defeated Dragon Lee to win his first professional wrestling title, the CMLL World Lightweight Championship.

[41] On September 3, Kamaitachi entered PWG's 2016 Battle of Los Angeles tournament, but was eliminated in his first round match by Trevor Lee.

[44] On November 5, 2016, at Power Struggle, Takahashi, once again working under his real name, made a surprise appearance after Kushida had defeated Bushi to regain the IWGP Junior Heavyweight Championship, challenging the new champion to a match at Wrestle Kingdom 11 in Tokyo Dome.

[45] On December 10, at the World Tag League finals, Takahashi accepted Tetsuya Naito's offer to join the Los Ingobernables de Japón (L.I.J.)

[47] On January 4, 2017, at Wrestle Kingdom 11 in Tokyo Dome, Takahashi defeated Kushida to win the IWGP Junior Heavyweight Championship for the first time.

[52] Takahashi suffered his first loss since his return to Japan on May 17, when he was defeated by longtime rival Dragon Lee in his opening match in the 2017 Best of the Super Juniors tournament.

On September 5 at Wrestle Grand Slam in MetLife Dome Night 2, Takahashi unsuccessfully challenged Robbie Eagles for the IWGP Junior Heavyweight Championship.

Takahashi received his title shot on Night 1 of Wrestle Kingdom 16, where he lost to Junior Heavyweight Champion El Desperado.

[69] Takahashi once again entered the New Japan Cup in March, once again having an impressive showing against heavyweight stars, defeating Minoru Suzuki and the NEVER Openweight Champion Evil.

[74] Instead in July, Takahashi made his NJPW Strong debut in the USA, losing in a three-way match to El Desperado and Blake Christian.

[76] On January 4, 2023, at Wrestle Kingdom 17, Takahashi defeated Master Wato, El Desperado and champion Taiji Ishimori to capture the IWGP Junior Heavyweight Championship in a four-way match, for a fifth time.

Following the show's main event, Takahashi returned to the ring, confronting his old LIJ stablemate Sanada, who had just defeated Kazuchika Okada to win the IWGP World Heavyweight Championship.

[87] Following confrontations in Impact Wrestling, Takahashi redeemed two of his losses in the Best of the Super Juniors tournament, defeating Lio Rush and Mike Bailey in a three-way match at Destruction in Ryōgoku.

[90] On February 11 at The New Beginning in Osaka, Takahashi and Naito defeated The Young Bucks to win the IWGP Tag Team Championships.