For the sake of her beloved husband, Rika agreed to live with her father-in-law. Enduring his constant sexual harassment, she bore it all for her husband's sake—until one day, the father-in-law suddenly assaulted her and creampie'd her. Unable to tell her husband, she continues to be tormented day after day. Despite her resistance, the father-in-law's relentless, persistent advances and his experienced techniques gradually drive her into ecstasy, making her climax uncontrollably as she sinks deeper into depravity.