In 1999, he landed in Osaka Pro, where he became a kaiju character named Monster Zeta Mandora. However, he gained fame in late 2001 by turning heel, donning a more traditional wrestling mask and renaming himself Big Boss MA-G-MA. He left the promotion in 2005.
His debut in Dragon Gate was heavily hyped. He first arrived wearing a motorcycle helmet, referring to himself as MA-G-MA. In what was to be his debut match, a singles match against CIMA, he instead removed the helmet and embraced CIMA, joining his faction of Blood Generation and renaming himself Magnitude Kishiwada. People questioned the addition of Kishiwada to Blood Generation, since one of the principles of Blood Generation was a "clean face" concept, but CIMA admitted that he only said that when he first formed the group just so Super Shisa couldn't join. Kishiwada would end Masaaki Mochizuki's 11-month reign as Open the Dream Gate Champion, becoming the first non DG-trueborn to win the Dream Gate title. He would suffer a severe shoulder injury, and drop the Dream Gate to Ryo Saito. Kishiwada would bring one of his running buddies from Osaka Pro, Gamma, into Blood Generation to be his replacement while he was out nursing his injury. However, Gamma and CIMA clashed, and this resulted in Blood Generation splitting in half, with CIMA leading a smaller face faction, and Naruki Doi and Gamma leading a heel faction. Doi's faction would win the rights to the name Blood Generation, but they immediately renounced it, instead renaming themselves the Muscle Outlaw'z. Upon his return, Kishiwada allied with the MO'z. Kishiwada began making fewer appearances for Dragon Gate. In 2007 he joined the Global Professional Wrestling Alliance, limiting his Dragon Gate time even further. As part of the GPWA, he has appeared in El Dorado, aligned with, but not actually a member of, heel faction Hell Demons. As many of the wrestlers in Dorado were formerly part of the Dragon system, and in a few cases on bad terms with the system, his participation in Dorado and Dragon Gate at the same time is considered controversial. With the Muscle Outlaw'z stable in Dragon Gate over, Magnitude Kishiwada has joined forces with Masaaki Mochizuki and Don Fujii in an "over 30" team, his first non-heel role in years. Their team would become Open the Triangle Gate Champions on September 28, 2008, beating Yasushi Kanda, YAMATO & Gamma. In 2009, Kishiwada would return to Osaka Pro briefly to participate in the company's 2009 Tennozan tournament, beating Daisuke Harada, Black Buffalo, and Atsushi Kotoge before losing to Billyken Kid in the finals of the tournament. By the end of 2009 he had stopped appearing on Dragon Gate cards, before returning in 2012 as a member of Kaettekita Veteran-gun. He would also make sporadic appearances over the next years.
