Kakihara and his Kingdom partner Yoshihiro Takayama debuted in All Japan Pro Wrestling in 1998. They reunited with Gary Albright to form the Triangle of Powerstable, which would get into a feud with The Holy Demon Army, but they split up later when Takayama left to found No Fear with Takao Omori and Satoru Asako. Kakihara then joined Mitsuharu Misawa and his Untouchables faction, where he teamed up with Yoshinari Ogawa. Out of kayfabe, Misawa wanted Kakihara to be pushed as the second member of the group, but Giant Baba opposed, feeling Kakihara was too undersized and hadn't paid his dues with the promotion yet. In 2000, Misawa, Kakihara and a large group of wrestlers left to form Pro Wrestling Noah. In his first match, Kakihara appeared wearing mixed martial arts gloves, and immediately after he left the promotion, claiming he was interested in competing for Pride Fighting Championships like several of his fellow shoot-style wrestlers. However, he instead returned to AJPW, where the Noah exodus had left new chances, and because of a few personal problems with fellow wrestler Takao Omori after the latter shot on him during a six-man tag team match involving him , Yoshinari Ogawa and Daisuke Ikeda against Omori, Takayama and Satoru Asako on NOAH's first show. He joined another shoot-stylist, Mitsuya Nagai, and they won the vacant All Asia Tag Team Championship against Yuji Nagata and Shinya Makabe. Their reign would be short, as Masahito suffered a knee injury and was forced to vacate the titles again. He didn't return to AJPW when he recovered.
New Japan Pro Wrestling (2001-2006)
In 2001, Kakihara debuted for New Japan Pro Wrestling. Upon his arrival, he formed an occasional alliance with two other shoot-style users, Masayuki Naruse and Minoru Tanaka. Tanaka and him competed for the vacant IWGP Junior Heavyweight Championship, but Kakihara was defeated. He spent the rest of his tenure as a midcarder, until in 2003 Kakihara shockingly won the Best Of The Super Junior X. However, his persistent injury impeded any lasting push he might have received. He seeemed to recover his momentum at the Best Of The Super Junior XI, but he was defeated at the very finals by Heat. Around this time, he also started competing in Kiyoshi Tamura's promotion U-style. He ended 2004 teaming with Takashi Iizuka to challenge two of Kakihara's former allies, Naruse and Nagai, for the very title Kakihara had gained in AJPW with the latter, the All Asia Tag Team Championship; however, Kakihara and Iizuka failed. Kakihara bounced around the roster for two more years, until in 2006 he announced his retirement from professional wrestling due to a spinal injury.
