Nabeshima is a third-year student who was once the captain of her judo team. She has earned the nickname "Queen of Fouls" due to her tendency to cheat outside of official matches. Despite hating natural geniuses like Akune, she is interested in Zenkichi and wants him to join the judo club and succeed her as its captain. Her plan to eliminate Akune and have Zenkichi take his place fails, but she manages to convince Medaka to make Akune the secretary of the Student Council. Nabeshima recognizes that she and Medaka are friends, despite her tendency to avoid situations where she could lose or get hurt. She is seen as a coward because of this, and remains unphased after others are emotionally scarred.
Ten years later, Nabeshima won a gold medal at the Olympics, despite snapping the ligaments in one of her knees. She is now retired, and teaches children in a small judo class. She is working with Aoki Aka towards a possible recovery.