Roman Yamashina is from class 3-1 and one of Kotarō Azumi's best friends who is in love with his homeroom teacher Ryōko Sonoda that he won't hesitate to show it. Roman is a active type of person who likes to hug Kotarō a lot whenever he feels like to. He likes to hang with his friends that he even wants them to skip their clubs just to have fun. He is really popular with girls, but he has feelings for his homeroom teacher, Ryōko-sensei which is mutual. He's a kind person who likes to help others.