Toshio always dreamed of being a police detective even when in high school, and upon graduation from Academy was assigned to the Inunaki ("Crying Dog") District Police Station in the heart of Tokyo.

While Toshio has wanted to marry Hitomi, he has vowed not to until he has captured the Cat's Eye (he has however made the first step and proposed to her).

While a bit clumsy and not very good at finding clues, his dogged determination and unyielding persistence has impressed his supervisors. He is however very stubborn and gets into verbal fights with his Chief constantly. Toshio doesn't carry a gun and prefers to use his wits and fists to contend with criminals. He has a weakness for beautiful women (especially blondes) and constantly makes Hitomi jealous.