Koharu Shirayama

She is a colleague of Chihiro Sengoku and teaches modern Japanese. She is also the homeroom teacher of Sorata Kanda's class. She graduated from both Suikou and Suimei University of the Arts, and has known Chihiro Sengoku and Kazuki Fujisawa since her student days. She particularly does not get along with the student Ryūnosuke Akasaka.