Hiromasa is a Japanese actor and director who started his career in his late teens, acting in a smaller theatre. In 2001, he founded Gunio-iro/Ultramarine, together with Takahashi Izumi, and they produced many films. Izumi acted and was the co-cinematographer of the film Sayonara sayo-nara (2005), Hiromasa's medium-length film which he directed, wrote and produced. In that same year, Hiromasa starred in Aru asa, soup wa (The Soup, One Morning, 2005), written and directed by Izumi. Two years later, Hiromasa directed his first feature-length film Hanauta dorobô (The Lost Hum). This was followed by dramas Ju-yon-sai (Fourteen, 2007) and Fit (2010). Apart from a few other roles in films by Takahashi Izumi, he played in Tennen kokekkô (A Gentle Breeze in the Village, 2007) by Nobuhiro Yamashita and Kaien Hoteru burû (2012) by Kôji Wakamatsu.