朝倉 音姫

Likes: Wagashi, acting like the ideal older sister
Dislikes: Perverted things, ghosts

Yume's older sister and non-blood-related older sister of Yoshiyuki. In contrast to the withdrawn and sullen character in her childhood, now Otome has turned into a sweet and caring girl. However, she sometimes switches to the "moralist mode" and lectures her carefree brother, but only does so with good intentions. 
Otome is upset of the fact that Yoshiyuki is too shy to take baths with her as they used to when they were younger. The way she sometimes straightens Yoshiyuki's collar in front of others looks more like a wife's care rather than a sister's. Therefore, some funny people never miss a chance to tease them. 
Otome is a proactive and responsible girl, so it's not surprising that she became the head of the Student Council. But in addition to other troubles, a more serious burden will fall on her shoulders. One day, she'll have to make the most difficult and dramatic choice in her life.