Azu, a female student attending a school in the city, lives alone with her salaryman brother as their parents often leave the house. Although Azu is quiet and an excellent student, she has a habit of daydreaming, imagining being dominated by older men and indulging in self-pleasure. One day, she is sexually assaulted in her sleep by Oshima, a neighbor who brought around a circular notice. This incident leads to her being targeted by Dango, a friend of Oshima, and Hato, a delinquent middle-aged man who is Dango's friend.