初恋学園・純愛科 (Hatsukoi Gakuen Jun'ai Ka)

Background
In this song, Len and GUMI (who is represented as a boy) are both in love with the class president (played by Rin). Len is too shy to confess to her, while GUMI acts very confident and flirtatious around her. In the end, Rin is asked to choose between the two of them; however, she does not make it clear who she chooses.