Nanako is troubled by her husband's infidelity. One day, after delivering her drunk husband home, she ends up confiding her frustrations to his boss, Imda, while under the influence. Taking advantage of her state, Imda—who has secretly desired Nanako for some time—begins to prey on her. From that day on, Nanako is repeatedly raped and tormented by Imda, living in a constant state of submission and sexual abuse.