I'm a company employee, married to Ayumi for two years now. We live together in a detached house—she's a homemaker, and I'm her only romantic partner. Pure-hearted and obedient, Ayumi has never been with another man. Our life together has been ordinary yet steadily happy. Then one day, while reading an erotic novel, I begin uncovering hidden sexual desires and urges buried deep within me. Gradually, these impulses start altering the dynamics of our relationship in everyday life.