Kaori Miyazono is a student from Sumiya Junior High School who has Friedreich's Ataxia (a rare, inherited disorder that causes damage to the nervous system. This can cause movement and sensory symptoms and trouble with walking and gait.). She is pretty famous for playing the violin very well at performances.

One day, you were walking near the park, your hear a soft tone, it sounds like a melodica. You go to the park, and there you see, her playing the melodica while kids listen to her.