While still a student at Tokyo Designer Gakuin College, Hirano began drawing in-betweens for Toei Doga.
released in 1984, he was selected as a character designer for the OVA Megazone 23 produced by Artland in 1985.
Iczer One was a project that he and his friend Aran Rei brought to Kubo Shoten, and it became a hit that turned into a series.
In the latter half of the 1980s, he directed OVAs for enthusiasts such as Dangaioh, Hades Project Zeorymer, and Daimajū Gekitō: Hagane no Oni, and gained a strong fan base.
Since the 1990s, he has been active as an animation director based at Tokyo Movie, where his Devil Lady, which combines elements of tokusatsu, splatter, horror, and action like Iczer One, was well received.