One day, married woman Miki Yoshii is suddenly summoned to her husband's workplace by one of his colleagues. The reason? Her husband has been caught up in an insider trading scandal. Using the incident as leverage, the colleague begins to sexually pressure and corner Miki. With no way to resist, she loses all ability to refuse—and ends up having her anus, a place her husband never touched, violated and pleasured. Enduring his slimy anal torment, Miki sinks deeper into feelings of guilt toward her husband and an unfamiliar, intoxicating pleasure. With each passing moment, her expression becomes increasingly that of a woman lost in ecstasy.