Answer - S3.E10

As QUARTET NIGHT prepares for the Triple S opening artist screening concert, they head off on a trip with Haruka to work on their song. Shining Saotome's orders are to create a "number one song that will make them shine." However, the members of QUARTET NIGHT have never worked with a songwriter to compose a song before. With no precedent to lean on, what kind of song with they produce...?