"Mizuki, the 'prince' of St. Nobara Academy, an elite all-girls school, is dating Akira, the 'princess' of Dankaisan, an infamous all-boys school next door. The two are members of Blaue Rosen, a girl band. Mizuki is unable to decide whether to sign with the agency after being told that their band will debut with Akira as the lead singer. Mizuki doesn't want to hurt Kaoru, the former lead singer of Blaue Rosen. Akira is frustrated with Mizuki's indecisiveness and decides to make his own solo debut as a female idol. Mizuki is worried that she might lose Akira, so she sings a love song to him at the school festival. Later she interrupts his debut concert and the two reaffirm their love. But now that Akira's debut has been canceled, the producer tells Akira to pay back the 489 million yen with his body!