Hiroki Kamijou AKA Hiro-san
Hiroki is 28. He is the Professor's Miyagi assistant in the classical literature departmant of M University. Formerly a Childhood friend of Usami, he used to be madly in love with until the day his path crosses Nowaki. Hiroki has a very passionate personality. He is a loner yet extremely temperamental. His students complain about how he doesn't hesitate to throw things at them when they are not paying attention in class.