Mischievous Butterfly

Briefly about Mischievous Butterfly manga:

She was a first-year student at a music high school and loved to play piano. She also secretly loved her friend, who had adored listening to Sakura play since they were kids. "I am really happy when you come to listen," says Sakura. "We are friends," replies Nanoha. As the group music competition for upperclassmen comes around, Sakura will be forced to make a choice between her passions and the person she loves.