Doi debuted in Toryumon Japan as part of the T2P. As one of his family members was a player for the Japanese baseball team the Yomiuri Giants, he was given a baseball gimmick and the name of Second Doi.
Doi was originally groomed as the top face for T2P, but injuries forced him to debut in Japan late and his growth was slightly stunted. He joined the Toryumon Japan roster, and Shin M2K as T2P ended its run, later joining Final M2K.
Dragon Gate
Doi continued on in Final M2K. At the end of 2004, he abruptly dropped the baseball gimmick and started competing under his real name.
In January 2005, Doi turned heel and joined
Open the Brave Gate Champion on March 13, and would hold it until November 13, when he lost it to Dragon Kid
.
On April 12, 2006, when
Gamma was kicked out of Blood Generation due to constant clashes with CIMA, Doi left with Gamma, along with Masato Yoshino and Naoki Tanizaki. It was unclear whether Doi or Gamma was the leader of the splinter faction. After Doi and Gamma won the rights to the Blood Generation name in a tag match against CIMA and Don Fujii eleven days later, Doi's faction renounced it, renaming themselves the Muscle Outlaw'z. The MO'z ranks would grow when Magnitude Kishiwada joined them after returning from a stint of injury, as well as referee Kinta Tamaoka. The group would lose Tanisaki later that year, but shortly after recruited Genki Horiguchi
. MO'z would also host any heel wrestlers visiting Dragon Gate.
Doi continued to gain rank in 2007, and formed a regular tag team with Masato Yoshino, known as Speed Muscle, an amalgamation of their respective nicknames "Speed Star" and "Bosou Muscle". Doi and Yoshino declared themselves the first
in January 2008, and then the Open the Twin Gate titles to Iwasa and Arai the month after, and opted to stop teaming with each other. Doi briefly teamed with Horiguchi while Yoshino pursued CIMA and the Open the Dream Gate championship. Yoshino put forward an impressive performance, and despite losing, was congratulated by both CIMA and Doi. Their team reconciled.
Doi and Yoshino's increasing popularity began to cause a split in the Muscle Outlaw'z, as Yoshino began to feud with stablemate
m.c. KZ
.
In August, he and Yoshino won the Summer Adventure Tag League Tournament for the second year in a row, and then a month later, on September 26, they captured the Open the Twin Gate Titles for a second time from
YAMATO and Cyber Kong. However, Doi would go on to become the ace of the promotion by year's end: He won the King of Gate
Tournament on December 19, and then nine days later he defeated Shingo Takagi to become the Open the Dream Gate Champion.
Doi in 2009
On May 5, he made a notable defense of the title against the former sumo champion-turned-wrestler
tweener, and once again began teaming with longtime partner Masato Yoshino. Doi unsuccessfully challenged YAMATO for the Open the Dream Gate Championship at Final Gate on December 25.[12]
Doi refused a handshake from YAMATO after the match, and was helped to the back by two men wearing pink hoods over their heads. On January 18, 2017, Doi saved Masato Yoshino, Kotoka, and Ben-K from an attack by VerserK. A match between the two sides was then set for February 2. On May 4, Naruki Doi reunited with Masato Yoshino and formed a new unit called MaxiMuM with Big R Shimizu, Ben-K, and Kotoka.
Foreign excursion
Doi became one half of the
TNA World X Cup Tournament and together they had matches against members of the other teams, losing each match. At Victory Road, Doi competed in the Ultimate X match
but came up short.
Doi has also appeared for the Hawaii-based Action Zone Wrestling, debuting with tag team partner Masato Yoshino on January 7, 2008 in a four-way tag team match. He later returned for singles action at AZW's third anniversary show Anniversary Annihilation on June 2, 2008 in a triple threat match against Akua and Sabaki.
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