Rumiko is the female teacher of Keiichi's class, who is a parody character of Tsukihime's Ciel-Senpai (permission for her usage was given by Type-Moon). The seiyuu for her character in the anime series is the same as the seiyuu of Ciel from the Tsukihime anime. Going along with the parody, her favorite food is curry rice, just like Ciel.