Sugamoto spent some years in the low card of Osaka Pro until finally breaking up in 2001, where he adopted the ring name of Gamma and the gimmick of a young punk.

Flanked by Big Boss MA-G-MA and Daio QUALLT, he achieved OPW's top heel status and feuded with Super Delfín and the rest of babyface wrestlers of the company.

His activity in M-Pro was mainly outside of the rings, but he managed to corrupt the Sato brothers into turning heel, attacking The Great Sasuke and helping him form the group STONED.

He turned up in Dragon Gate on March 19, 2006, being brought in by Magnitude Kishiwada (previously known as Big Boss MA-G-MA) to take over his position in Blood Generation while he recuperated from a severe shoulder injury.

Naruki Doi, Masato Yoshino, and Naoki Tanizaki followed him, causing Blood Generation to split in two, with them on one side and CIMA, Don Fujii and Shingo Takagi on the other.

On April 23, 2006, he and Doi beat CIMA and Fujii in a tag match to earn full rights to the Blood Generation name, but they immediately renounced it, instead forming the Muscle Outlaw'z faction.

Speculation still exists as to whether this was the intended finish to the match or not, but nevertheless, his victory won him the right to face CIMA for his Open the Dream Gate Title, which was set for February 3, 2008.

He became a dual champion on May 14, when he, Shingo Takagi and YAMATO won the newly vacated Open the Triangle Gate titles, beating Naruki Doi, Masato Yoshino and BxB Hulk in a decision match.

He would win the Triangle Gate titles back with Yasushi Kanda and YAMATO on July 12, and lost them to Masaaki Mochizuki, Don Fujii and Magnitude Kishiwada on September 28.

He began making a slow turn to the face side for the first time in his career, but a shadow of doubt was cast over his future in Dragon Gate.

In August 2009, he and CIMA participated in the annual Summer Adventure Tag League Tournament, but they performed very poorly, winning only one match out of eight and finishing in last place.

On May 13, 2010, Gamma, CIMA and Genki Horiguchi defeated Don Fujii, Masaaki Mochizuki and Akebono to win the Open the Triangle Gate Championship.

On October 25, 2010, Gamma, CIMA and Horiguchi lost the Open the Triangle Gate Championship to Naoki Tanisaki, Yasushi Kanda and Takuya Sugawara.

[6] On June 18, Gamma, Masato Yoshino and YAMATO defeated the Blood Warriors team of CIMA, Naruki Doi and BxB Hulk to win the vacant Open the Triangle Gate Championship.

On October 8, Gamma formed a new unit with CIMA, Eita, El Lindaman, Punch Tominaga, and rookies Takehiro Yamamura and Kaito Ishida.