After training in the All Japan Dojo, Miyamoto debuted on August 19th, 2001 against Hiroshi Hase. A Jr. Heavyweight when he debuted, for the remainder of the year he opened cards and wrestled different veterans to help him hone his craft. On 1/3/02 he picked up his first pinfall victory in a tag team match, and on 1/9/02 he had his first singles victory over Yasu Urano. For the rest of 2002 he continued wrestling towards the beginning of the card, waiting for his chance to elevate to a more meaningful role.
In 2003, Miyamoto would finally get that chance. In the "Royal Road Initiation 7 Match 'Intense' Series", Miyamoto would face off against Genichiro Tenryu on 2/16/03. Also in February of 2003 he formed a tag team with Tomoaki Honma called Turmeric Storm. As Turmeric Storm they would be staples of the mid-card, picking up victories over teams such as Shigeo Okumura and Taichi Ishikari, Hideki Hosaka and Ryuji Hijikata, Gran Naniwa and Jun Kasai, and many others. On February 11th, 2004 they would challenge Great Kosuke and Shiryu for the All Asia Tag Team Championship, but they would lose when Shiryu pinned Miyamoto. Soon after, Miyamoto would begin his excursion, traveling to America.
Miyamoto would stay in America for over a year, wrestling for a variety of wrestling promotions. Wrestling both as himself and "The Great Kazushi" (a gimmick similar to The Great Muta), Miyamoto wrestled in Professional Championship Wrestling, USA Pro Wrestling, Border City Wrestling, River City Wrestling, and others. He also wrestled in TNA, and June 23rd, 2004 he appeared on PPV to team with Nosawa to wrestle America's Most Wanted. He also appeared on TNA Impact! several times, including in a match against Triple X. Besides TNA, Miyamoto made two appearances in Ring of Honor. On July 23rd, he defeated Shawn Daivari and on July 24th he wrestled in a six man match with Trent Acid winning. In August and November of 2004 he appeared again in TNA, on both event wrestling in multi-man gauntlet matches. Overall the excursion to America appeared to be a success, as he had experienced wrestling in many different promotions and even won the Texas Wrestling Entertainment Texas Heavyweight Championship in early 2005.
During the summer of 2005, Miyamoto would return to All Japan. On July 15th, 2005 he wrestled Akira Raijin in his return match, winning in less then four minutes to show his growth. His return to All Japan would not last long, however, as on November 22nd, 2005 it was announced that Miyamoto was leaving All Japan for a new promotion called Kings Road. Originally Kings Road was rumored to have Kawada as their ace, but Kawada never appeared for the promotion. Defecting with Miyamoto included All Japan wrestler Shota Takanishi and Freelancer Genichiro Tenryu. Kings Road would have its first event on January 15th, 2006.
On the main event of the first Kings Road event, Miyamoto main evented against legend Genichiro Tenryu, with Tenryu picking up the victory. Miyamoto continued being the ace of Kings Road, main eventing against Takao Omori on the February event and teaming with Taichi Ishikari against Mitsuya Nagai and Daisuke Ikeda at the April event. By now the promotion was in serious trouble, as Kawada's participation never materialized and they had no wrestlers that were draws as Tenryu had only wrestled on the first event. Their next two events would be held in much smaller venues (with the attendance under 500 for both), and on July 1st, 2006 the main event would be a special 5 vs. 5 match against Zero-One MAX, with the stipulation being that if Kings Road lost then they would disband. Kings Road would lose the match when Sai pinned Ishikari for the final fall, and Kings Road would fold for good.
After Kings Road went under, Miyamoto failed to gain entrance back into a major promotion. He had wrestled in New Japan during his Kings Road stint, facing Tanahashi on March 19th, 2006, but it did not lead to a permanent position. On January 20th, 2007 he appeared in Osaka Pro as the secret new member of Bad Force, but he only wrestled on one card and wasn't seen again. He also wrestled for Lock Up! on July 1st, 2007 against Uwano, but he was not invited back. Unable to find steady work, Miyamoto created his own promotion in the fall of 2007 called Super Bulls. In Super Bulls, again Miyamoto was the ace of the promotion. On the last event of 2007, on December 27th, he wrestled Great Sasuke in the main event with Great Sasuke picking up the victory by DQ. Miyamoto is still young, and even though as of the end of 2007 his career is in limbo there is always a chance that he will get another chance in a major promotion if he continues to improve.