Wrestling Marvelous Future (2003–2004) Miyamoto would find himself as a trainee in WMF (Wrestling Marvelous Future) as he would spare with
Mammoth Sasaki. His debut would come on August 2, 2003 against
Mineo Fujita in
Tokushima, Japan. He would then become aligned with the
Wrestling of Darkness 666 promotion, run by The Crazy SKB.
Big Japan Pro Wrestling (2004–present) Miyamoto would go on to compete in
Big Japan Pro Wrestling (BJW) in which he would begin working in the death match style in 2006, after BJW ran a recruitment for wrestlers to compete in
deathmatches. Miyamoto would then go on to win his first ever death match in his career. In the deathmatch circles, Yuko found himself a generational rival in
Isami Kodaka. In 2007 Miyamoto would begin teaming with
Takashi Sasaki as the two would remain as a team, off and on, throughout the years to come, they even got close to winning the BJW
Saikyo Tag League and becoming the new
BJW Tag Team Champions. On May 4, 2008 Miyamoto defeated the veteran
Shadow WX to win the
BJW Deathmatch Heavyweight Championship. Miyamoto would go on to compete in the United States in 2009 and even go on to capture the CZW Ultraviolent Championship from
Nick Gage. Miyamoto would go on to make five successful defenses with the belt defeating
Masashi Takeda,
Abdullah Kobayashi,
Mad Man Pondo, Takashi Sasaki and Isami Kodaka before losing it to
Ryuji Ito on May 4, 2010. In 2010, Miyamoto formed a new tag team named "Deathmatch Nichokenju", later renamed "Yankee Nichokenju", with longtime rival Isami Kodaka. On May 5, 2011 Yankee Nichokenju won their first title together, when they defeated
Jaki Numazawa and
Jun Kasai for the BJW Tag Team Championship. On March 29, 2012, Miyamoto defeated his partner Isami Kodaka to win the
DDT Extreme Championship as part of an interpromotional rivalry between
Union Pro and BJW. On April 1, Kodaka and Miyamoto also lost the BJW Tag Team Championship to
Shinobu and Yoshihito Sasaki. On May 5, 2014, Yankee Nichokenju faced off in a 300 fluorescent light tube TLC deathmatch for the BJW Deathmatch Heavyweight Championship. Kodaka won the match, making his fourth successful title defense. On May 31 Yankee Nichokenju lost the BJW Tag Team Championship to Twin Towers (
Kohei Sato and
Shuji Ishikawa), ending their eighteen-month reign at seventeen successful title defenses. On June 15 Miyamoto would recapture the BJW Deathmatch Heavyweight Championship defeating Ryuji Ito. On November 21, Yankee Nichokenju defeated
Abdullah Kobayashi and Ryuji Ito in the finals to win their third Dai Nihon Saikyo Tag League in a row. On December 31, Yankee Nichokenju took part in Toshikoshi Puroresu, an annual new year's collaboration event between BJW, DDT and
Kaientai Dojo, winning the Tenka Toitsu! tournament, held for the first time in a tag team format. After five successful title defenses Miyamoto lost the BJW Deathmatch Heavyweight Championship to Abdullah Kobayashi on May 5, 2015.
DDT Pro-Wrestling (2013–present) On August 18, 2013 at
Ryōgoku Peter Pan 2013, DDT's biggest event of the year, Miyamoto and Kodaka defeated
Hikaru Sato and
Yukio Sakaguchi to win the
KO-D Tag Team Championship for the first time and become double tag team champions. Following their win, Miyamoto and Kodaka vowed to successfully defend their double crown hundred times. Yankee Nichokenju went undefeated for most of 2013, before losing to Speed of Sounds (
Hercules Senga and
Tsutomu Oosugi) in a non-title match on October 18. Miyamoto dominated independent wrestling awards ceremony, winning the Best Unit Award with Isami Kodaka. Yankee Nichokenju's reign as double tag team champions came to an end on January 26, 2014, when they lost the KO-D Tag Team Championship to the
Golden☆Lovers (
Kenny Omega and
Kota Ibushi) in a three-way match, also involving the team of
Konosuke Takeshita and
Tetsuya Endo. On June 12, 2016, during a DDT event Miyamoto pinned
Danshoku Dino, claiming Dino's Right To Challenge Anytime Anywhere contract. After the match he declared that he wanted to challenge Konosuke Takeshita for the
KO-D Openweight Championship. On July 3, Miyamoto unsuccessfully challenged Takeshita for the KO-D Openweight Champion. Later Miyamoto would join the stable Smile Squash in DDT and form a team with
Harashima named Smile Yankees. On August 28 at
Ryōgoku Peter Pan 2016, Smile Yankees defeated
KAI and Ken Ohka to win the KO-D Tag Team Championship. On September 25, Smile Yankees defeated
Daisuke Sasaki and Tetsuya Endo to make their first successful title defense of the KO-D Tag Team Championship. On October 9, Miyamoto and Harashima lost the KO-D Tag Team Championship in the second title defense to Sasaki and Endo in a rematch.
All Japan Pro Wrestling (2015–present) In October 2015, Yankee Nichokenju took part in
All Japan Pro Wrestling (AJPW)'s
Jr. Tag Battle of Glory, where they finished second with a record of two wins, one draw and one loss, suffered against
Atsushi Aoki and Hikaru Sato in their last round-robin match, the
de facto final of the tournament. On November 15, Kodaka and Miyamoto defeated
Kotaro Suzuki and
Yohei Nakajima in a decision match to win the vacant
All Asia Tag Team Championship. During Miyamoto and Kodaka's title defenses of the All Asia Tag Team Champions Yankee Nichokenju joined the
Axe Bombers stable. After six successful title defenses, Miyamoto and Kodaka lost the All Asia Tag Team Championship to Atsushi Aoki and Hikaru Sato on July 24 at a BJW event.
Other appearances On July 27, Yankee Nichokenju won women's wrestling promotion
Pro Wrestling Wave (Wave)'s
Tag Team Championship by defeating Las Aventureras (
Ayako Hamada and
Yuu Yamagata). On August 24, Yankee Nichokenju lost the Wave Tag Team Championship to Sakuragohan (
Kyusei Sakura Hirota and
Mika Iida) in a
three-way match, which also included Las Aventureras. On October 2, Kodaka made an appearance for
Pro Wrestling Noah, teaming with Yuko Miyamoto and
Daisuke Sekimoto in a six-man tag team main event, where they defeated
Atsushi Kotoge, Hitoshi Kumano and
Naomichi Marufuji. In July, Miyamoto made it to the finals of
Pro Wrestling Zero1 (Zero1)'s 2015
Tenkaichi Jr. tournament, but was defeated there by
Takuya Sugawara. Also in Zero1, Yankee Nichokenju joined the stable
Dangan Yankies. ==Championships and accomplishments==