A refined and elegant piano teacher named Hiromi, married to a lawyer who recently started his own practice. She has always maintained a proper, virtuous demeanor, careful not to tarnish her husband's reputation. Yet, her feminine instincts eventually overwhelm her restraint, causing her to lose herself completely. One day, on a whim, she reclaims her womanhood, craving a bare, raw cock with desperate longing. This impulsive decision opens the door to a new, forbidden path.