As a young girl, Jun Naruse is excitable and talkative. One day, she sees her father exit a love hotel, accompanied by another woman. Without understanding the situation, she tells her mother, resulting in her parents’ divorce, and her father blaming her for this. While she is crying, she imagines a fairy egg that curses her by sealing her words so she won’t hurt people again. As a result of her “curse”, Jun is unable to speak and she suffers stomachaches whenever she tries to.The anthem of the heart
Years later, when Jun is attending high school, her homeroom teacher, Kazuki Jōshima, signs her up as a member of the Charity Committee along with three other classmates: Takumi Sakagami, Natsuki Nitō, and Daiki Tasaki. When she goes to the Committee’s room to reject her position, Jun hears Takumi singing and is captivated. She then tells Takumi of her past, using her phone, and requests him to turn her words into a song. In this way Jun learns that, though she cannot speak, the ‘curse’ isn’t in effect if she sings. Her class decides then to perform a musical for their school festival, based on the story of her experience narrated in the form of a fairy tale.
While discussing the musical, Daiki has a falling out with his teammates that is stopped by Jun, who consequently has another stomachache for talking, but this improves her bonds with the other Charity Committee members. Misunderstanding Takumi’s concern for Jun as a sign that he is falling in love with her, Natsuki tells Takumi that she will cheer them on despite her own feelings for Takumi.The next day, Daiki makes amends with his teammates. As they spend time together preparing for the musical, Jun starts to develop feelings for Takumi, while Daiki starts to develop feelings for Jun. Daiki asks Takumi regarding his relationship with Natsuki, having heard rumours that both of them were dating during middle school, but Takumi denies this since Natsuki had told her classmates then that they were not dating when she was asked.