Ruri Gokō (Gokō Ruri) / Kuroneko (lit. Black Cat)
Voiced by: Kana Hanazawa
Photo by Yenra
Ruri is a 15-year-old otaku girl who lives near Kirino and later enrolls into 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. 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. Kuroneko is very prideful like Kirino, 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, to where Kirino comments she needed to use a dictionary to translate her novel. Kuroneko actually wears red contact lenses to make her bluish eyes appear red.
Kuroneko has two younger sisters, Hinata and Tamaki, whom she dearly cares for, though her sisters and mother worry about Ruri when she is in her otaku mode. At school, Kuroneko wears normal clothes and at home takes care of her younger sisters. She later joins the video game club after she enrolls into Kyosuke's school; she is very good at playing video games. She dates Kyosuke for over summer vacation before breaking up with him. However, she still harbors feelings for Kyosuke. Kyosuke later rejects her feelings and she accepts that they will not be together.