Ruri is a 15 year-old otaku girl who lives near Kirino and later enrolls in Kyosuke's school. She often wears gothic lolita clothing based on a character from her favorite anime, even during hot weather, and will sometimes add cat ears and a tail. She calls herself Kuroneko (black cat) and wears contact lenses to make her blue eyes appear red. Due to both of their tsundere-type personalities, she constantly clashes with Kirino. However, both girls genuinely care for each other and value the time they spend together. Like Kirino, Kuroneko is very prideful but is willing to swallow her pride to achieve a goal. Unlike Kirino, who likes little sister-themed games and magical girl anime, Kuroneko enjoys teen-centered fantasy anime. She often mentions "dark magic", claiming that she has it. She is noted to have a very large vocabulary - Kirino once comments that she needed to use a dictionary to translate her novel.
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