You play as Yukimura Aine, a shy high school girl who becomes the lyricist for the rock band Lucifer after meeting the vocalist of the band, Ookouchi Sakuya. You get to interact with the various male characters (members of Lucifer as well as other characters) and build potential relationships with them. The male characters will react in various ways depending on your actions and answers. There is also a musical mini-game. Based on “Kaikan Phrase”, a popular manga and anime written by Mayu Shinjo.