[7] Kotoge and Harada are former three-time Osaka Pro Wrestling Tag Team Champions and have also worked together for various other promotions across Japan and for Philadelphia, Pennsylvania–based Chikara in the United States.

Kotoge made his debut for Osaka Pro Wrestling on April 29, 2005, at the promotion's sixth anniversary show, facing Kabuto Beetle in a losing effort.

[11] Just a month later on February 11, the team came to an abrupt end, when Kotoge turned heel and joined the Bad Force stable, which, beside Gaina and Zero, also included Condor, Hideyoshi, Kazushi and Masamune.

[11] In March 2009, Kotoge entered the Indie Junior Challenger Determination tournament, defeating tag team partner Daisuke Harada in his first round match.

[15] On June 6, 2009, Tadasuke, considered the lowest ranking member of Blood & Guts, turned on the stable and joined rival group LOV (Legion of Violence).

[9][12][18][19] On May 9, Kotoge and Harada teamed with Takoyakida to defeat Tokyo Gurentai (Fujita, Mazada and Nosawa Rongai) for the UWA World Trios Championship.

[18][19] On October 15, 2010, Kotoge and Harada made their debuts for Pro Wrestling Noah to take part in the 2010 Nippon TV Jr. Heavyweight Tag League.

[18][19] On January 15, 2011, Kotoge and Harada returned to Noah to unsuccessfully challenge Atsushi Aoki and Naomichi Marufuji for the GHC Junior Heavyweight Tag Team Championship.

[30] Four days later Kotoge and Harada returned to Pro Wrestling Noah to take part in the 2011 NTV G+ Cup Junior Heavyweight Tag League.

[39] In April 2010, Kotoge along with Harada and their former Blood & Guts partner Tadasuke traveled to the United States to represent Osaka Pro in Chikara's 2010 King of Trios tournament.

In their first round match in the tournament on April 23, Team Osaka Pro defeated The UnStable (Colin Delaney, Stigma and Vin Gerard).

[41] On March 1, 2011, Chikara announced that Kotoge and Harada would be returning to the promotion for the 2011 King of Trios, this time teaming with the reigning Osaka Pro Wrestling Battle Royal Champion Ultimate Spider Jr.[43] On April 15, Team Osaka Pro defeated the Throwbacks (Dasher Hatfield, Matt Classic and Sugar Dunkerton) in their first round match.

After Kotoge also scored the pinfall, which eliminated team number nine, 3.0 (Scott Parker and Shane Matthews), he and Harada faced off with representatives from rival promotion Dragon Gate, Kagetora and Super Shisa.

In the end, Kotoge was able to score his third pinfall of the day, winning the match for Momo no Seishun Tag, while also earning the team their third point, which guaranteed them a shot at the Campeonatos de Parejas, which was at the time held by Jigsaw and Mike Quackenbush.

[46][47] On August 25, Chikara announced that Momo no Seishun Tag would return to cash their points on October 7, challenging brand new Campeones de Parejas, F.I.S.T.

[48][49] On October 7 in Burlington, North Carolina, Momo no Seishun Tag failed to capture the Campeonatos de Parejas as they were defeated by Taylor and Gargano two falls to one, following interference from Icarus.

[65] In April, Kotoge got to take part in his first Global Tag League, when he replaced an injured Naomichi Marufuji and became Takashi Sugiura's new partner for the tournament.

[66] While the tournament was still ongoing, Kotoge and Ishimori received another shot at the GHC Junior Heavyweight Tag Team Championship on April 21, but were defeated by the defending champions, Genba Hirayanagi and Suwa.

[74] After Harada and Kumano had failed to win the GHC Junior Heavyweight Tag Team Championship from Liger and Tiger Mask, Kotoge and Ishimori received another shot at the title on October 5, but were again defeated by the NJPW representatives.

[77] Kotoge and Ishimori's reign as GHC Junior Heavyweight Tag Team Champions lasted only 22 days, before they lost the title back to Ogawa and Sabre in their first defense on April 12.

[95] Later that same day, they defeated the reigning GHC Junior Heavyweight Tag Team Champions El Desperado and Taka Michinoku in the finals to win the tournament.

[108] On June 12, Kotoge and Harada won a three-way match, defeating the Suzuki-gun team of Michinoku and Taichi as well as Gedo and Jado, to make their third successful title defense.

[109][110] The following month, Kotoge and Harada made it to the finals of the 2016 NTV G+ Cup Junior Heavyweight Tag League, but were defeated there by A. C. H. and Taiji Ishimori.

[124][125] Kotoge's heavyweight debut took place on January 7, 2017, when he and Naomichi Marufuji unsuccessfully challenged Go Shiozaki and Maybach Taniguchi for the GHC Tag Team Championship.

[133][134] On August 26, Kotoge won his first title as a heavyweight, when he and Go Shiozaki defeated Maybach Taniguchi and Naomichi Marufuji for the GHC Tag Team Championship.