Hideo is an uptight and strait-laced yet dependable young man. He works as a lieutenant in the military. He despises people who fool around and don't take things seriously. He's a clean freak with a steadfast and serious personality. He's cold even towards people he's fond of, and has a "tsundere" personality type. He's stern and disciplined, but not unreasonable. Despite acting distant at times, he won't hesitate to step in to protect or care for the people he loves.