Masahiro Mashiro is the father of Moritaka Mashiro. He is the older brother of Nobuhiro Mashiro. His face is never revealed in the series. In his school days, Masahiro was the captain of the karate team, and won several trophies. Like his father, Masahiro believed Moritaka would follow in Nobuhiro's footsteps and become a mangaka; when his wife told him bout Moritaka desire to do so, he gave his consent. He later gives an inspirational speech to his son, using manga references.