Mio Kouzuki

Mio is a mute underclassman of Kheis with abundant expressions. Since she cannot speak she uses a sketchbook to carry on written conversations. She belongs to the theater club as a junior of Yukimi Miyama. While she performs nonspeaking parts she handles her own role reliably. She is quite a dojikko an anime stereotype for klutzy cute girls. Other than the sketchbook she uses she has an older sketchbook which she treasures greatly. From Wikipedia.