Kaori is mainly featured in Shiori's arc. However, as she's Nayuki's best friend as well as Yuuichi's classmate, she's regularly seen. As the class representative, Kaori is smart and very knowledgeable about the townspeople and everyone attending their school. Despite her extensive knowledge, she is not aware of the supernatural events that happen around her.

Spoiler

She completely ignores her younger sister, Shiori, because of Shiori's illness. Kaori believes that if she forgets about Shiori's existence, the pain of losing her won't be as strong.