The dark persona of Tokino Sora. Her name literally means "night/dark skies" if written in kanji (夜の空).
She is basically a color inverse of Sora, with long grey hair. Depictions of her outfit varies: some give her a bat hair ornament in lieu of Sora's distinctive star-and-ribbon hair ornament, black vest, orange shirt, and red skirt; others depict her wearing a darker tone version of Sora's distinctive star-and-ribbon, black vest, white shirt, and a black skirt.