Ootori Kouji teaches geography and history at Tokyo's elite private academy, Seitei Gakuen. Standing 185 cm tall and weighing 74 kg with blood type AB, he is widely known as "the smiling noble" due to his perpetually gentle demeanor and soft-spoken nature, earning him high regard among students. He exhibits zero tolerance for individuals living with him without permission. Kouji expresses significant concern over the erratic behavior of fellow teacher Katsuragi Ginji, whose unpredictable actions cause him distress.