Kohaku is a 3rd year student at F . High School, an exemplary and very good student but a bit timid and does not participate in other activities. Kohaku has a rather slim and small build but still has a manly aura (maybe).He is very shy and is often at a disadvantage when it comes to buying food and other carrying things. He has short but uncut hair, blue eyes and glasses, and is 1.73 meters tall. His body is quite small,so finding a uniform is quite difficult,so he usually wears a wide uniform.