During middle school, Arisu Yamabuki's sole comfort was a radio program hosted by a girl called Apollo. He listened to it faithfully every night until she suddenly ceased broadcasting. Although he had very few clues regarding Apollo's identity, Yamabuki investigated her thoroughly, which eventually led him to enroll in the newly co-ed Furin High School in hopes of finding her there. As Yamabuki suspected, the broadcasting club's first announcement is delivered by the familiar voice he admires. However, upon entering the club room, Yamabuki realizes his search will not be so simple. The four members—Rikka Inohana, Shinobu Uzuki, Nene Himekawa, and Iko Kirino—all sound like Apollo in different ways. Yamabuki joins the club mainly to find Apollo, but he soon discovers that each girl aspires to pursue her own career using her voice. Seeing that there is much room for improvement, Yamabuki takes it upon himself to help the girls reach their individual goals, though he never stops looking for his favorite Apollo.