Natsukawa Runa, a college student, is shocked by the disbandment of a popular idol group which she loves. One day, while caring for a drunken guy at a college drinking party, she discovers he is Subaru, her bias, who has gone MIA after the announcement. When Subaru realizes that he has been exposed, he threatens her by taking her picture, saying: Should I expose you so you can't go against me? What'll happen to Runa now that she finds out the true nature of her bias?!