From Chibi Manga:
Sugimoto Hatsune is desperate for studying and for P.E. But she can see the "ontama" of the music, a strange creature who gives powers. Thanks to this power, she is discovering by the conductor of the music group: Shion-sempai, who let her enter in their chorus! The other sempai in the chorus are really kind with her, but Shion-sempai is so rude with her...but little by little, it looks like Shion-sempai fall for Hatsune's voice...?

Here is a sparkling story about first love and adolescence♪