Kamine Shuuta is a person who can see a person's heart (literally) whether its angry, wounded, broken, guarded, troubled etc... and because of this he's at his wits end, because he can't do anything about it. Tokisaka Hibiki is a saxophonist in the music club. Shuuta first listens to his saxophone on the terrace and wanted to ask something but Shuuta tells him to come to his performance later in the ongoing school festival. After seeing Hibiki's performance he see the notes of music as hands which can heal the wounded, tend the broken, break the shielded hearts in other words "seize the soul" of a person. After the performance Shuuta asks Hibiki "isn't there a person to whom your sound doesn't reach" when asked how he knew it Shuuta says although his sounds can seize hearts of others and move them but his own heart is guarded and is unmoved and troubled. Hibiki then takes Shuuta to his childhood friend Moko (Takizawa Momoko) who loved singing but became mute due to some reason. Shuuta sees her as a Sea of depression and despair Thus begins their journey to heal the heart with music.