Kazuhiro Mikazuki was the husband of Saho Mikazuki and the late father of Subaru Mikazuki. Both he and Saho perished in a tour bus collision before the series begins.

He possessed a tall stature, middle-aged features, short gray-black hair, and black eyes. His typical outfit included a brown coat over an orange collared undershirt, paired with light brown pants. On his final trip, he wore a khaki coat, a white collared undershirt, and blue pants fastened with a black belt.

His given name Kazuhiro blends the meanings "harmony, peace" (和, kazu) and "vast, broad, wide" (弘, hiro). The family name Mikazuki means "crescent moon" (朏).

Kazuhiro's death profoundly shaped his son Subaru's life, contributing to Subaru's initial reclusiveness prior to Haru's adoption.