Kohinata Kanade is a second year violin student at Seiso Academy's Music Division. She lives together at the school dorm called Linden Hall with her childhood friends, brothers Kisaragi Ritsu and Kyouya. They practice intensively day after day at their orchestra club, aiming for victory at the nationwide music concours. However, one day Kanade is told by a boy she doesn't know "Your performance has no flower"?!