Mio Kouzuki  

, 上月 澪

Mio is a mute underclassman of Kōheis who possesses numerous facial expressions despite being unable to speak. She communicates through written conversations using a sketchbook as her primary tool. As a junior member of the theater club, Yukimi Miyama, she excels in performing non-speaking roles with precision. Despite her clumsy and adorable nature, which aligns with the stereotype of dojikko anime characters, Mio values her older sketchbook dearly.