Ruri Gokou, also known as Kuroneko, is an otaku who is a member of the Otaku Girls Unite! online community and an avid fan of the Maschera: Lament of a Fallen Beast series. She is known for her gothic lolita attire and her sharp tongue. She and Kirino Kousaka met each other during one of the group's offline meetings, and they eventually became friends, although the journey is not as smooth as it sounds. She later becomes the classmate of Kyousuke Kousaka, Kirino's older brother, and became close to him during Kirino's training in America.