Naho is a third-year piano student at a music college. She dreams of becoming a professional pianist and she is working hard. Such a girlfriend is a popular pianist, Katsuraichi Ohno, whom Naho admires. The two of them met through Shota, the son of Jimbo Music Store, where they both frequent each other. Taken by Shota, Ohno comes to Naho's house, and attacks Naho on the pretext of brushing up on Naho's sensibility, which is lacking in her piano.
