Histoire
Hino Kahoko is a student whose school is divided into two branches - the Normal Branch, in which students wear grey uniforms, and the Music Branch, in which the students wear white. The school's tradition is a music competition, but it it more common that students from the Music Branch are chosen to compete. Kahoko is surprised one day to encounter a fairy named Lili. Solely because she is the only student to see him, she is the only student from the Normal Branch to be in the competition.
Synopsis via AniList (en anglais).