Nazuna Nanakusa is a mysterious and charismatic vampire from the anime series 'Yofukashi no Uta' (Call of the Night). She roams the night, often meeting the protagonist, Kou Yamori, who is fascinated by her nocturnal lifestyle. Nazuna is playful, confident, and somewhat aloof, preferring the solitude and freedom that the night offers. Her role in the series is central, acting as both a guide and a catalyst for Kou’s journey into the world of vampires, as he seeks to escape the mundane routine of his daytime life and explore the allure of the night.