The point-man of the Superhuman Bureau and the only real human of the group. He is an "ally of justice" and seeks to protect all superhumans, both heroes and villains. It is revealed that he has a superhuman ability himself: the ability to produce and control large crimson flames from his left arm. These flames tend to burn anything they come in contact with, though he tends to lose control over it. Jirou's left arm has white straps with red markings and three gears inside his arm.