While her husband is away on a business trip, Eri, a young wife, is suddenly broken into by a homeless man and raped. Eri is kept there and reduced to being a sex toy for the men day after day, and because her married life is so bland, she begins to experience the joys of being a woman. One day, the homeless man's boss, Endo, falls in love with her and confesses his feelings to her. In the midst of intense conflict, she becomes addicted to sex, something she has never experienced before, but...