Yukiko Nanjou is an adult woman with distinctive purple eyes and purple hair, typically styled in a bun. She favors traditional clothing, frequently wearing kimonos. Yukiko co-runs the nightclub Scarar alongside the uncle of another character, Suguru, serving as its manager. In this capacity, she acts as a nurturing figure to the club's women, who affectionately call her "Yukiko-mama." Her personality blends compassion and warmth with passion and opportunism.

Her background includes an encounter where she rescued Suguru after finding him injured from a beating, leading to an intimate relationship between them. Later, when Suguru coincidentally moved into the same building where she resides, she offered him an open invitation to visit her whenever he wishes to "relax," maintaining their personal connection.