The series tells the story of the five students; Yuuta Hoshitani, Tooru Nayuki, Kaito Tsukigami, Kakeru Tengenji, and Shuu Kuga as they struggle to enter the musical department of Ayanagi Academy, a school focusing on music. (Source: Wikipedia)

The manga started its serialisation in Dengeki's Sylph magazine before the anime aired, but it is officially stated to be a comicalization. It shows the main characters at the point when they have just entered the school, gives more background and has original scenarios not seen in the anime.