Mihara is an alum of Tokyo University of Agriculture, which he represented at the 2002 JOC Junior Olympic Cup, where he finished third at 76 kg (168 lb) weight class in amateur wrestling.

[2] Mihara spent the rest of 2007 in Mexico, losing his hair to Cerebro Negro in a Lucha de Apuestas on June 21 and winning the 2007 Rey del Ring on July 26.

[2][3] Through the new alliance, Yamato also made his debut for New Japan Pro-Wrestling on October 13, 2008, at Destruction '08, in a six-man tag team match, where he, Kai and Kojima were defeated by Great Bash Heel (Togi Makabe, Tomohiro Ishii and Toru Yano).

[14] As a result, he was granted his first shot at the World Junior Heavyweight Championship, but was defeated in the title match on January 11 by the defending champion, Kaz Hayashi.

[19] In April 2011, Yamato and Kondo took part in the 2011 Junior Tag League, from which they were eliminated after losing to the Voodoo Murders team of Mazada and Super Hate in their final round-robin match.

[22] On February 14, Yamato reunited with Shuji Kondo to unsuccessfully challenge Atsushi Aoki and Kotaro Suzuki for Pro Wrestling Noah's GHC Junior Heavyweight Tag Team Championship.

[23] In April, Yamato took part in the 2012 Junior Tag League alongside DDT Pro-Wrestling and Pancrase representative Hikaru Sato, with the two failing to advance from their round-robin block.

[27] Before the end of the year, Yamato racked up five successful title defenses,[2] against Minoru Tanaka,[28] Hikaru Sato,[29] Kenny Omega,[30] Kaz Hayashi,[31] and Koji Kanemoto.

[34] That same day, Yamato reunited with Hikaru Sato to formally challenge the Junior Stars of Koji Kanemoto and Minoru Tanaka for the All Asia Tag Team Championship.

[35] On January 10, Yamato and Sato held a public training session, during which they shaved each other's heads to show that they were a cohesive unit ahead of their upcoming title match.

[40] From March 30 to April 7, Yamato and Sato took part in the 2013 Junior Hyper Tag League, where they made it all the way to the finals, before losing to Burning (Atsushi Aoki and Kotaro Suzuki), whom they had defeated in their opening match of the tournament.

[45][46][47][48] On June 20, Yamato announced his resignation from All Japan out of loyalty to his trainer Keiji Mutoh, who had left the promotion when Nobuo Shiraishi took over as its new president at the beginning of the month.

Prior to leaving All Japan, Yamato was entered into one more storyline, where a disappointed Hikaru Sato announced his return to the promotion to take on his former Jounetsu Hentai Baka partner.

[56][57][58] During Wrestle-1's inaugural event on September 8, Yamato wrestled in the opening match, where he and the debuting Daiki Inaba defeated Tokyo Gurentai (Mazada and Nosawa Rongai).

[65] The following day, Yamato produced his own small outdoor professional wrestling event in Chiba, during which he and Daiki Inaba defeated Kai and Ryota Hama in a tag team match.

[81][82][83] Yamato received a rematch for the title on July 6 at Wrestle-1's second Ryōgoku Kokugikan event, Shōgeki: Impact, where he defeated Van Gasteren to become the new EWP Intercontinental Champion.

[114] Mihara is a qualified personal fitness trainer, high school agriculture teacher, assistant surveyor, retail salesperson and hazardous materials engineer.