Kuromiya Eimi was unsatisfied with sex with her husband. Her sexual desires remained unfulfilled, until one day she met another man through a dating app on her smartphone. Through sex with this man, she experienced the pleasure of vaginal orgasm—something she had never felt before. However, that brief moment of ecstasy was meant to be just a one-time mistake for Eimi. A few days later, the man from the dating app showed up at her home with his accomplices, drugged her husband into unconsciousness, and proceeded to drive Eimi into a frenzy of orgasmic madness according to their desires. Gradually succumbing to this torturous pleasure of vaginal orgasms, Eimi is pushed beyond the point of no return.