Main heroine of the series. Nanaka is one of Sana's friends, and seemed to have feelings for Sana. When Sana returns to town after five years, her personality has completely changed from sweet and caring to a cold demeanor, and moody. When she meets Sana again after he returned she slaps him for apparently not knowing who she was. She still seems to have romantic feeling as she gets jealous whenever Sana is with another girl (especially Asami).
Nanaka was a victim of possible arson shortly after Sana left Sakuranomori, and lost both her parents during the fire; she managed to escape the fire with only her violin and the sakura bracelet Sana gave her. Since certain parts of the event were unknown to her, her uncle and aunt have since then taken her into custody and make sure she never remembers that event that has caused her so much pain.
Soon afterward, she remembers what had happened in the fire. Her father had started the fire because of Nanaka's mother cheating on him with his best friend, who was also Nanaka's violin teacher and her real father.
In the epilogue of the anime she became a famous violinist and Sana asked her to marry him before the concert.
