Orihara was trained in the All Japan Pro Wrestling Dojo under Genichiro Tenryu's tutelage.
In 1992, Orihara was sent to Mexico, where he learnt the high-flying lucha libre style and wrestled for Consejo Mundial de Lucha Libre as Iga, a masked ninja character.
Upon his return to SWS, now named Wrestle Association R, Masao showed his new style and competed in memorable cruiserweight bouts with Ultimo Dragon, with whom he formed a long friendship.
Alongside their work in Michinoku Pro, Orihara and Ono became a mainstay team on Battlarts.
Currently, Orihara is a part of Satoru Sayama's Real Japan Pro Wrestling and Tenryu Project.