Masaru Hishi is the alias used by Japanese voice actor Kousuke Okano for his work in adult anime and games. Born on October 14, 1969, in Tokyo Prefecture, Okano has built a career spanning several decades in the voice acting industry. He began his voice acting career in the early 1990s, with one of his first credited roles being in the series The Irresponsible Captain Tylor in 1993.

Throughout his career, Okano has been affiliated with several talent agencies. He was formerly associated with Production Baobab and later worked as a freelancer. Between July 2015 and June 2018, he was with Still Wood Garden, and since August 1, 2018, he has been affiliated with SSP. Beyond his voice acting, he is also known for his work as a narrator, frequently appearing on the Japanese anime television network Animax, often alongside fellow voice actress Yukari Tamura.

As Kousuke Okano, he has performed a wide variety of roles in mainstream anime. Some of his notable characters include Son Goku in the 1999 series Saiyuki, Recca Hanabishi in Flame of Recca, Noboru Yoshikawa in Great Teacher Onizuka, and Kenta Nakamura in the Initial D series. His filmography also includes roles such as Eddie Kobayashi in Crush Gear Turbo, Rikichi Yamada in the Nintama Rantaro franchise, and Mahiro Atori in Hiiro no Kakera.

It is under the alias Masaru Hishi that he is credited for his performances in adult-oriented projects. As the user query notes, he plays the role of Matagoro Yoshimura in the adult anime series Samurai XXX, an alternative title for the 2004 OVA Youkou no Ken. This alias allows for a distinction between his mainstream voice acting work and his contributions to adult content. Other aliases he has used in his career include Ogasawara Takao.