Ayana Kakinozaka  

, 柿乃坂 綾奈

The teacher responsible for assigning rooms to new students is clumsy and made a mistake by assuming Yuuki was a girl. As a result, he was placed in the girls' dormitory. After realizing her error, she moved into his room to prevent him from being expelled. However, it seems that she might be causing more problems for Yuuki now.