Junichi's and Ayatsuji's classmate.

Spoiler

In the anime: She accuses Ayatsuji to have a relationship with Junichi and because of this she is abandoning her duties as organizer of the Founder's Festival. In response Ayatsuji reveals her true nature and driving her away. She makes almost all of the students abandon Ayatsuji for this, but later Ayatsuji apologizes to her and asks for her help again. In the end she agrees to help her. They later watch the Miss Santa contest together.