Airi tries on new underwear in front of the mirror, hoping that her husband will see her as a woman. Peeping at her, Uchimura, a young man from next door, falls in love with her. One day, Airi goes out of control and forcibly takes Airi's chastity. Her husband refuses to look at his wife's conflicted state, and she begins to accept her neighbor, who wants to embrace her out of loneliness. She sends her husband off, unaware of her mistake, and today the married woman is once again drowning in the pleasure of infidelity...