Sandy Fishburne, occasionally documented under the surname Fishbarn, is a New York City lounge singer pursuing jazz stardom without yet securing widespread fame. She has blonde hair and blue eyes. Her vocal talent draws Lupin III's attention, leading him to mentor her career advancement as a secondary storyline. This unfolds parallel to a central heist plot focused on a ring and a fabled brooch. Her performances occur at a venue displaying prominent "SUNDAY" signage, strongly suggesting the club's identity. This special marks her sole appearance across all Lupin III media, including seasons, films, OVAs, and spin-offs.